The equilibrium constant expression for the reaction is:
Keq = [NO₂]² / [NO]² * [O₂]Hence, None of the choices are correct: option E is correct.
What is the equilibrium constant of a reaction?The equilibrium constant of a reaction is a measure of the ratio of the equilibrium concentration of the products of a reaction, to the equilibrium concentration of the reactants where each concentration is raised to a power corresponding to the coefficient in the balanced equation of the reaction.
The equilibrium constant of the reaction is obtained as follows:
equation of the reaction: 2 NO (g) + O₂ (g) ---> 2 NO₂ (g)
Keq = [NO₂]² / [NO]² * [O₂]
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1. What are the theoretical yield and the percent yield of the reaction if 1200.0 grams of KClO3 decomposes to produce 600.0 grams of KCl?
KClO3 (s) ⟶ KCl (s) + O2 (g)
______________________
2. In a test, 705 grams of water and 302 grams of sodium oxide react according to the equation below.
Na2O(s) + H2O(l) ⟶ NaOH(s)
a. What is the limiting reactant?
b. What is the theoretical yield in grams of NaOH are produced from this reaction?
c. What is the percent yield of the reaction if 145 grams of NaOH is produced in the laboratory?
____________________
3. In a test, 3.00 L of pentane (C5H12, d = 0.6262 g/mL) reacts with 3200.0 grams of oxygen according to the reaction below.
C5H12(l) + O2(g) ⟶ CO2(g) + H2O(g)
a. What is the limiting reactant?
b. How many liters of water (density = 1.00 g/mL) can be produced from this reaction?
The percent yield of KCl is 82.2 %. The percent yield of sodium hydroxide is 36.99 %. The reaction produces about 1.35 L of water.
What is the percent yield?1)
Number of moles of potassium chlorate = 1200.0 grams/122.55 g/mol
= 9.79 moles
If 2 moles of potassium chlorate produces 2 moles of potassium chloride then 9.79 moles of potassium chloride is produced.
Theoretical yield = 9.79 moles * 74.55 g/mol
= 729.8 g
Percent yield = actual/theoretical * 100/1
= 600.0 grams / 729.8 grams * 100/1
= 82.2 %
2)
Number of moles of water = 705 grams/18 g/mol = 39.2 moles
Number of moles of sodium oxide = 302 grams/62 g/mol
= 4.9 moles
If the reaction is 1:1 the sodium oxide is the limiting reactant
1 mole of sodium oxide produces 2 moles of sodium hydroxide
4.9 moles of sodium oxide produces 4.9 moles * 2 moles/ 1 mole
= 9.8 moles
Theoretical yield of the sodium hydroxide = 9.8 moles * 40 g/mol
= 392 g
Percent yield = 145 g/392 g * 100/1
= 36.99 %
3)
Mass of the pentane = density * volume
= 0.6262 g/mL * 3000 mL
= 1878.6 g
Number of moles of the pentane = 1878.6 g/72 g/mol
= 26.1 moles
Number of moles of oxygen = 3200.0 g/32 g/mol
= 100 moles
If 1 mole of pentane reacts with 8 moles of oxygen
26.1 moles of pentane reacts with 26.1 moles * 8 moles/1 mole
= 208.8 moles
Hence oxygen is the limiting reactant
If 8 moles of oxygen produces 6 moles of water
100 moles of oxygen would produce 100 moles * 6 moles/8 moles
= 75 moles
Mass of water produced = 75 moles * 18 g/mol = 1350 g
Since volume = mass/density
Volume of water = 1350 g/1.00 g/mL
= 1350 mL or 1.35 L
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how many mL of 0.100M NaCl would be required to make a 0.0350M solution of NaCl when diluted to 150.0mL with water?
The volume of 0.100M NaCl that would be required to make a 0.0350M solution of NaCl when diluted to 150.0mL with water is 52.5mL.
How to calculate volume?The volume of a diluted solution can be calculated using the following formula;
CaVa = CbVb
Where;
Ca = initial concentrationVa = initial volumeCb = final concentrationVb = final volumeAccording to this question, 0.100M NaCl would be required to make a 0.0350M solution of NaCl when diluted to 150.0mL with water. The volume can be calculated as follows:
0.1 × Va = 0.0350 × 150
0.1Va = 5.25
Va = 52.5mL
Therefore, 52.5mL is the volume required to dilute the sodium chloride solution.
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How was electron dicovered (detailed answer required)
Answer:
J.J. Thomson.
Explanation:
The credit for the discovery of the electron and its properties goes to J.J. Thomson based on his experiments carried out in a discharge tube. He suggested that electrons are necessary constituents of all atoms. J.J. Thomson carried out experiments by taking a gas at low pressure of 0.01mm Hg in a discharge tube.
Answer:
J.J. Thomson used a Crookes, or cathode ray, tube to conduct experiments that led to the discovery of the electron in 1897. He provided evidence that cathode rays have a negative charge. He also investigated positively charged neon gas particles.
Explanation:
If the Gravitational Radius (Rg) of a black hole is 2 miles per solar mass (Mʘ), what would be the Rg of the black holes with the following masses:
What are the following masses
Please complete the questions
The gravitational radius (Rg) of the black holes would be approximately; 4.0 Mʘ black hole: 0.00332179 miles, 10.0 Mʘ black hole: 0.00830584 miles, 25.0 Mʘ black hole: 0.0207646 miles, and 10^8 Mʘ black hole: 8,305.84 miles.
To calculate the Gravitational Radius (Rg) of a black hole, you can use the formula:
Rg = 2 × G × M
where Rg is gravitational radius, G is gravitational constant (approximately 6.67430 × 10⁻¹¹ m³ kg⁻¹ s⁻²), and M is mass of the black hole in solar masses (Mʘ).
Given that Rg is defined as 2 miles per solar mass (Mʘ), we can convert the result to miles using the conversion factor of 1 mile = 1.60934 kilometers.
Let's calculate the Rg for the different masses
For a 4.0 Mʘ black hole:
Rg = 2 × G × M = 2 × (6.67430 × 10⁻¹¹ m³ kg⁻¹ s⁻²) × 4.0
Rg = 5.33944 × 10⁻¹⁰ m = 0.00332179 miles
For a 10.0 Mʘ black hole:
Rg = 2 × G × M = 2 × (6.67430 × 10⁻¹¹ m³ kg⁻¹ s⁻²) × 10.0
Rg = 1.33486 × 10⁻⁹ m = 0.00830584 miles
For a 25.0 Mʘ black hole:
Rg = 2 × G × M = 2 × (6.67430 × 10⁻¹¹ m³ kg⁻¹ s⁻²) × 25.0
Rg = 3.33715 × 10⁻⁹ m = 0.0207646 miles
For a 10⁸ Mʘ black hole:
Rg = 2 × G × M = 2 × (6.67430 × 10⁻¹¹ m³ kg⁻¹ s⁻²) × (10⁸)
Rg = 1.33486 × 10¹⁰ m = 8,305.84 miles
Therefore, the gravitational radius (Rg) of the black holes would be approximately:
4.0 Mʘ black hole: 0.00332179 miles
10.0 Mʘ black hole: 0.00830584 miles
25.0 Mʘ black hole: 0.0207646 miles
10^8 Mʘ black hole: 8,305.84 miles
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--The given question is incomplete, the complete question is
"If the Gravitational Radius (Rg) of a black hole is 2 miles per solar mass (Mʘ), what would be the Rg of the black holes with the following masses: A 4.0 Mo black hole? B 10.0 Mo black hole? C 25.0 Mo black hole? D 108 Mo black hole? "--
Enough of a monoprotic acid is dissolved in water to produce a 1.03 M solution. The pH of the resulting solution is 2.69 . Calculate the Ka for the acid.
Based on the concentration and pH of monoprotic acid, the Ka for the acid is 4.04 * 10⁻⁶.
What are acids?Acids are defined as a substance that when dissolved in water produces hydrogen ions as the only positive ions in the solution.
The number of hydrogen ions that an acid produces per molecule of the solution is known as the basicity of the acid.
When an acid produces one mole of hydrogen ions per molecule of acid, the acid is said to be monobasic or monoprotic.
When an acid produces two moles of hydrogen ions per molecule of acid, the acid is said to be dibasic or diprotic.
The given acid is said to be monoprotic.
Let the monoprotic acid be HA.
The dissociation of HA in the solution is given as follows:
HA ⇄ H⁺ + A⁻
Ka = [H⁺] * [A⁻] / [HA]
[H⁺] = [A⁻]
The pH of the acid solution is 2.69
Hence
[tex][H^{+}] = 10^{-pH}[/tex]
[tex][H^{+}] = 10^{-2.69}[/tex]
[H⁺] = 0.00204
[A⁻] = 0.00204
[HA] = 1.03 M
Hence, Ka will be:
Ka = (0.00204 * 0.00204) / 1.03
Ka = 4.04 * 10⁻⁶
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Answer:
Music has the ability to deeply affect our mental states and raise our mood. When we need it, music gives us energy and motivation. When we're worried, it can soothe us; when we're weary, it can encourage us; and when we're feeling deflated, it can re-inspire us.
Explanation:
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25 mL of a 0.50 M BaCl2 solution mixed with 25 mL of a 0.50 M Na2CO3 solution and 2.0g of BaCO3 is collected. What is the percent yield of BaCO3?
Taking into account the reaction stoichiometry, the percent yield of BaCO₃ is 81.07%.
Reaction stoichiometryIn first place, the balanced reaction is:
BaCl₂ + Na₂CO₃ → BaCO₃ + 2 NaCl
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
BaCl₂: 1 moleNa₂CO₃: 1 moleBaCO₃: 1 moleNaCl: 2 molesDefinition of molarityMolarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by:
molarity= number of moles÷ volume
Amount of reagent in this caseIn first place, you know:
Molarity of BaCl₂= 0.500 MNumber of moles of BaCl₂= ?Volume of BaCl₂= 25 mL= 0.025 L (being 1000 mL= 1 L)Molarity of Na₂CO₃= 0.500 MNumber of moles of Na₂CO₃= ?Volume of Na₂CO₃= 25 mL= 0.025 L (being 1000 mL= 1 L)Replacing in the definition of molarity:
0.500 M= number of moles of Na₂CO₃÷ 0.025 L
Solving:
number of moles of Na₂CO₃= 0.500 M× 0.025 L
number of moles of Na₂CO₃= 0.0125 moles
0.500 M= number of moles of BaCl₂÷ 0.025 L
Solving:
number of moles of BaCl₂= 0.500 M× 0.025 L
number of moles of BaCl₂= 0.0125 moles
This indicates that 0.0125 mol of Na₂CO₃ and 0.0125 mol of BaCl₂ are present.
Since the stoichiometric ratio of the reactants is 1:1, if 0.0125 mol of Na₂CO₃ and BaCl₂ are present, since the amounts are equal, it makes no difference to work with any of the reactants.
Percent yield
The percent yield is the ratio of the actual return to the theoretical return expressed as a percentage.
The percent yield is calculated as the experimental yield divided by the theoretical yield multiplied by 100%:
percent yield= (actual yield÷ theoretical yield)×100%
where the theoretical yield is the amount of product acquired through the complete conversion of all reagents in the final product, that is, it is the maximum amount of product that could be formed from the given amounts of reagents.
Theoretical yield of BaCO₃The following rule of three can be applied: if by reaction stoichiometry 1 mole of BaCl₂ form 1 mole of BaCO₃, 0.0125 moles of BaCl₂ form how many moles of BaCO₃?
moles of BaCO₃= (0.0125 moles of BaCl₂×1 mole of BaCO₃)÷ 1 mole of BaCl₂
moles of BaCO₃= 0.0125 moles
Being the molar mass of BaCO₃ 197.35 g/mole, the theoretical yield of BaCO₃ is calculated as:
theoretical yield of BaCO₃= 0.0125 moles× 197.35 g/mole
theoretical yield of BaCO₃= 2.466875 grams
Percent yield for the reaction in this caseIn this case, you know:
actual yield= 2 gramstheorical yield= 2.466875 gramsReplacing in the definition of percent yield:
percent yield= (2 grams÷ 2.466875 grams)× 100 %
Solving:
percent yield= 81.07%
Finally, the percent yield for the reaction is 81.07%.
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How many moles of He are in a
container with a volume
of 5.6 L at STP?
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 0.25moles of He are in a container with a volume of 5.6 L at STP.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.
One mole of ideal gas has 22.4L volume at STP.
number of moles of Helium = Given volume ÷volume occupied by gas at STP
Given volume of helium = 5.6 L
Substituting all the given values, we get
number of moles of Helium = 5.6 L ÷22.4L
number of moles of Helium =0.25moles
Therefore, 0.25moles of He are in a container with a volume of 5.6 L at STP.
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Answer: 0.25 moles
Explanation:
Given volume of helium = 5.6 L
Substituting all the given values, we get
number of moles of Helium = 5.6 L ÷22.4L
number of moles of Helium =0.25moles
Therefore, 0.25moles of He are in a container with a volume of 5.6 L at STP.
Olivia is performing an experiment with a series circuit that contains a battery and two bulbs. In the middle of the experiment both bulbs stop burning at the same time. She finds that the battery no longer has a charge. What is the best explanation of the energy in the circuit? Responses The energy in the battery was transformed into electrical energy, light energy, and heat energy. The energy in the battery was transformed into electrical energy, light energy, and heat energy. The electrical energy in the circuit was used up. The electrical energy in the circuit was used up. The electrical energy was transformed by an insulator. The electrical energy was transformed by an insulator. The energy in the battery was not conserved
The energy in the battery was transformed into electrical energy, light energy, and heat energy is the best explanation of the energy in the circuit (Option A).
How energy is conserved in a battery?The energy is conserved in a battery as chemical energy that can be used by converting it into electrical energy, a process that is well known to release heat.
Therefore, with this data, we can see that the energy conserved in a battery is a form of chemical energy that can be converted into electrical energy for use.
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A small unknown metal object has a mass of 85.20g. A graduated cylinder is filled
with 70.00 mL of water, and when the object is dropped into the water, the water
level rises to 79.95 mL. What is the density of the metal cylinder?
Pour water into a graduated cylinder, measure the volume, submerge the object, and measure the volume again. The metal cylinder has a density of 0.1167.
Explain about the metal cylinder?These cylinders are used to test density and specific gravity. Smooth surfaces and meticulously turned ends. a collection of six various pieces in cylinder shape for density in electrical and thermal studies.
Weighing a metal object twice, once in air and once submerged in a liquid, yields the density of the metal, as described in the section The science behind density measurements.
An item of laboratory equipment known as a measuring cylinder, graduated cylinder, cylinder measurement, or mixing cylinder is used to measure the amount of liquids, chemicals, or solutions during routine lab work.
The object's volume can be calculated as the difference between the two volume measurements. The density of the object can now be determined by simply dividing the mass by the volume.
79.95 - 70.00 = 9.95
=9.95 ÷ 85.20
=0.1167
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What is the binding energy for the nuclide 199F (atomic mass: 18.9984 amu) in MeV per nucleus?
The binding energy per nucleon for the ¹⁹F nucleon is equal to 7.786 MeV/nucleon.
What is binding energy?Binding energy can be defined as the minimum quantity of energy that is required to remove the particle from the system. Nuclear binding energy can be described as the energy required to dismantle a nucleus of an atom into free neutrons and protons.
The binding energy will be determined from the mass defect. Mass defect is calculated from the difference between the mass observed and the expected combined mass.
Given the mass of the ¹⁹F = 18.9984 a.m.u.
The mass defect for the ¹⁹F can be calculated as:
Δm = [tex](M _n +M_p) - M_F[/tex]
[tex]\triangle m =( 9\times 1.0078 + 10 \times 1.0087 )- 18.9984[/tex]
[tex]\triangle m =0.1588 \;a.m.u.[/tex]
The binding energy for the fluorine can be calculated as:
E = Δmc²
E = 0.1588 × 931.5
E = 147.92 MeV
The binding energy per nucleon of ¹⁹F can be calculated as:
B.E.N. = 147.92/18.9984 = 7.786 MeV per nucleon
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Methylhydrazine, CH6N2 is commonly used as a liquid rocket fuel. The heat of combustion of methylhydrazine is -1.30x10^3 kJ/mol. How much heat is released when 100.0g of methylhydrazine is burned?
The heat released by 100g of the compound is 2.8 x10^3 kJ .
What is combustion?We know that the process of combustion is the process that enables a substance to be burnt in air. Heat and light can be produced in the process of the combustion.
Number of moles of the Methylhydrazine = mass/ molar mas = 100.0g/46 g/mol = 2.17 moles
If from the balanced reaction equation;
1 moles of Methylhydrazine produces 1.30x10^3 kJ
Then 2.17 moles of Methylhydrazine produces 2.17 moles * 1.30x10^3 kJ/1 mole
= 2.8 x10^3 kJ of heat.
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This time, include both the coefficient and exponent. Express 0.00212 in scientific notation.
[?] * times 10^[?]
Enter the coefficient in the green box and the exponent in the yellow box.
Coefficient (green) Exponent (yellow)
_______________ _____________ Enter
Answer: 212
Explanation:
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The reaction used to prepare iodine in the laboratory is
2LiI(s)+2H₂SO₄(aq)+MnO₂(s)→Li₂SO₄(aq)+MnSO₄(aq)+I₂(aq)+2H₂O(l)
The oxidation state of Li in LiI is +1 and of I in LiI is -1.
The oxidation state of the element is defined as the number of electrons gained or lost by an element in the compound. Since Li is present in the 1st group of the periodic table and it contains one valence electron in it. It loses one electron to form Li⁺ ion. Hence, the oxidation state of Li in LiI is +1.
Iodine(I) element is present in the 17th group of the periodic table. It contains seven valence electrons in it and it requires one electron to complete its octet. When it gains one electron, it forms I⁻ ion. Hence, the oxidation state of I in LiI is -1
Therefore, the oxidation state of Li in LiI is +1 and of I in LiI is -1.
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1. Consider the following mechanism. [4 Marks]
03 O2 + 0 (fast)
03+0202 (slow)
(a) Write the overall balanced chemical equation.
(b) Identify any intermediates within the mechanism.
(c) What is the order with respect to each reactant?
(d) Write the rate law for the overall reaction.
Consider the following mechanism.
The overall balanced chemical equation : 2O₃ ----> 3O₂
The intermediates within the mechanism : O
The order with respect to each reactant : 2
The rate law for the overall reaction : R = k[O₃]²/[O]
The equations are :
O₃ ----> O₂ + O fast
O₃ + O ---> 2O₃ slow
a) The overall reaction is given as :
2O₃ ----> 3O₂
b) The intermediates within the mechanism is O.
c) The order with respect to each reactant is 2
d) slow step rate : k[O][O₃]
at equilibrium, kc = [O][O₂] / [O₃]
The rate law = R = k[O₃]²/[O]
Thus, Consider the following mechanism.
The overall balanced chemical equation : 2O₃ ----> 3O₂
The intermediates within the mechanism : O
The order with respect to each reactant : 2
The rate law expression for the reaction : R = k[O₃]²/[O]
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How many atoms are there in 6 moles of Silicon (Si)?
Answer:
36.132 × 10²³ atoms of Si
Explanation:
Formula we use,
→ No. of moles × 6.022 × 10²³
Now the atoms will be,
→ No. of moles × 6.022 × 10²³
→ 6 × 6.022 × 10²³
→ 36.132 × 10²³
There are 36.132 × 10²³ atoms.
which option correctly describes a covalent species that has four electron groups around the central atom? select all that apply.
The option that correctly describes a covalent species that has four electron groups around the central atom are:
The ideal bond angle for a four-electron system is 109.5°.If all four electron pairs are bonding pairs, the shape of the system is tetrahedral.A bent shape is observed if there are two bonding pairs and two lone pairs.What is the covalent species that has four electron groups around the central atom?It should be noted that when a molecule have four electron groups and it is been found around the central atom and this will orients the four groups in the direction of a tetrahedron.
However when there are four atoms attached to these electron groups, in Tetrahedral Geometry, molecular shape will also be also tetrahedral.
Instance of this is Methane (CH 4), in conclusion, in the case whereby all four electron pairs are bonding pairs, then it can be concluded that the shape of the system is tetrahedral.
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missing options:
The ideal bond angle for a four-electron system is 109.5°.
If all four electron pairs are bonding pairs, the shape of the system is tetrahedral.
The eletron are not bonding in the system.
A bent shape is observed if there are two bonding pairs and two lone pairs.
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Calcium chloride, CaCl2, is a white, crystalline salt that is very soluble in water.
Calcium chloride is an inorganic compound, a salt with the chemical method CaCl 2. it is a white crystalline strong at room temperature, and it's miles exceptionally soluble in water.
Solubility is defined as the maximum amount of a substance in an effort to dissolve in a given quantity of solvent at a special temperature. Solubility is a characteristic asset of a particular solute-solvent combination, and special substances have significantly differing solubilities.
Solubility refers to the finest quantity of solute that may dissolve in a recognized quantity of solvent at a given temperature. In a solvent, an answer is a homogeneous mixture of one or more solutes. A not unusual instance of an answer is sugar cubes brought to a cup of tea or coffee.
Dissolution is the process where a solute in a gaseous, liquid or stable section dissolves in a solvent to shape an answer. Solubility is the maximum awareness of a solute that may dissolve in a solvent at a given temperature. at the most attention of solute, the solution is said to be saturated.
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what can be said about altitude, atmospheric pressure, and the partial pressure of oxygen? check all that apply.
Answer:
As altitude increases, partial pressure of O2 increases. -
Explanation:
-As altitude increases, partial pressure of O2 increases. -As atmospheric pressure increases, available O2 increases. -As atmospheric pressure increases, partial pressure of O2 increases. Boyle's law states there is a direct relationship between the pressure and volume of a gas at a constant temperature.
8. A 220 mL sample of helium gas is in a cylinder with a movable piston at 105 kPa and 275K. The piston
is pushed until the sample has a volume of 95.0 mL. The new temperature of the gas is 310K. What is the
new pressure of the sample?
a. 51.1 kPa
b. 216 kPa
c. 243 kPa
d. 274 kPa
The sample has a new pressure of 274kPa. If at 105 kPa and 275K, a 220 mL sample of helium gas is contained in a cylinder with a moving piston. The sample is pushed till it has a 95.0 mL volume and 310K .
The macroscopic characteristics of ideal gases are related by the ideal gas law (PV = nRT). A gas is considered to be perfect if its particles (a) do not interact with one another and (b) occupy no space (have no volume). Where P= pressure V= volume and T = temperature.
From ideal gas equation
P₁V₁/T₁ =P₂V₂/T₂
105×220÷275 = P₂ ×95÷310
P₂= (105×220×310)÷(275×95)
P2= 7161000/26125
P2 = 274.105 kPa
Hence, the new pressure of helium gas is 274kPa
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How many atoms does 2.0 moles of Helium (He) represent?
Answer:
12.044×10^23
Explanation:
Molecular mass is the sum of atomic masses of the elements present in a molecule. 12 gram of carbon that is one mole contains
6.022×10^23 atoms
. It is called Avogadro's constant.
So, Number of particles = Given number of moles
×
Avogadro number.
Therefore, the number of atoms of He in 2.0 moles = 2.0× 6.022×10^23= 12.044×10^23
There are
12.044×10^23
atoms in 2.0 moles of Helium.
If you have 25 moles of water, H2O, how many molecules of water do you have?
Answer:
The number of molecules of water us 1.50× 10²⁵ molecules
Explanation:
From N=nL
where L =avogadro number ( 6.02× 10^²³ entities)
The number of the molecules of water =1
n (amount of substance)=25 moles
hence (N) = 25×1×6.02×10^²³
=1.50×10²⁵ molecules of H2O
Resilience describes an ecosystem's ability to maintain dynamic equilibrium True or False
Answer:
True (the statement is correct)
Explanation:
Yeah, resilience describes an ecosystem's ability to maintain dynamic equilibrium.
Resilience is the capacity to cure from difficulties. Hence, the statement is true.
Calculate the pH of the following strong acids: 0.100 moldm-3 hydrochloric acid, HCl 0.025 moldm-3 sulphuric acid, H2SO4 0.005 moldm-3 nitric acid, HNO3 0.200 moldm-3 phosphoric acid, H3PO4 i) Ethanoic acid (CH3COOH) is a weak acid; explain why HCl is a strong acid and CH3COOH is a weak acid. Write the expression for the acid dissociation constant (Ka), for ethanoic acid. Calculate the pH of a 0.01 moldm-3 solution of ethanoic acid.(Ka CH3COOH = 1.7 x10-5 moldm-3)
The pH of the ethanoic acid can be obtained as 3.39.
What is the pH?We know that the pH has to do with the negative logarithm of the hydrogen ion concentration of a solution. We know that we have to apply the formula for the pH so as to obtain the pH of the solutions.
pH of hydrochloric acid = - log( 0.100) = 1
pH of sulphuric acid = - log( 0.025 ) =1.6
pH of nitric acid = - log (0.005) = 2.3
pH of phosphoric acid = - log ( 0.200) = 0.69
We say that HCl is a strong acid because it s able to dissociate completely in solution while the ethanoic acid does not dissociate completely in solution.
For the dissociation of ethanoic acid we have;
Ka = [[tex]H_{3} O^+[/tex]] [[tex]CH_{3} COO^-[/tex]]/[[tex]CH_{3} COOH[/tex]]
1.7 x10^-5 = x^2/0.01 - x
1.7 x10^-5(0.01 - x) =x^2
1.7 * 10^-7 - 1.7 x10^-5x - x^2 = 0
x^2 + 1.7 * 10^-5x - 1.7 * 10^-7 = 0
x=0.0004 M
pH = - log(0.0004 )
pH = 3.39
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Question 2
0.600 g of solid NaNO3 were dissolved with deionized water, transferred into a 2.00 L volumetric flask
and the volume was completed to the mark with water.
a. What is the concentration of NaNO3 solution in molarity?
b. What is the concentration of nitrate (NO3) in ppm?
c. What is the mass percentage of Na in NaNO3 (Na%)?
Molarity (M) is the amount of a substance in a sure quantity of solution. Molarity is described because the moles of a solute according to liters of an answer. Molarity is also called the molar attention of an answer.
Calculation:-
mass = 0.600 g
the molar mass of NaNO₃ = 85 g
moles = 0.600/85
= 0.007 moles
volume = 2 L
molarity = moles/volume
= 0.007 /2
= 0.035 M
Molar concentration is a measure of the attention of a chemical species, specifically of a solute in an answer, in terms of the amount of substance in step with the unit extent of the answer. In chemistry, the most generally used unit for molarity is the number of moles in keeping with liter, having the unit symbol mol/L or mol/dm³ in SI unit.
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Calculate the Molecular or Formula massof each of the following:
(a) P4
(b) H2O
(c) Ca(NO3)2
(d) CH3CO2H(acetic acid)
(e) C12H22O11(sucrose, cane sugar)
The molecular or formula mass of each of the given substances is given below:
(a) P₄ = 128 amu
(b) H₂O = 18 amu
(c) Ca(NO₃)₂ = 124 amu
(d) CH₃CO₂H (acetic acid) = 60 amu
(e) C₁₂H₂₂O₁₁ (sucrose, cane sugar) = 342 amu
What is the molecular or formula mass of each of the given substances?The molecular or formula mass of a substance id the sum of the masses of the atoms of the elements present in that substance.
The molecular or formula mass of each of the given substances is determined as follows:
(a) P₄ = 32 * 4
P₄ = 128 amu
(b) H₂O = 2 * 1 + 16
H₂O = 18 amu
(c) Ca(NO₃)₂ = 40 + (14 * 2 + 16 * 3 * 2)
Ca(NO₃)₂ = 124 amu
(d) CH₃CO₂H = 2 * 12 + 4 * 1 + 16 * 2
CH₃CO₂H = 60 amu
(e) C₁₂H₂₂O₁₁ = 12 * 12 + 1 * 22 + 16 * 11
C₁₂H₂₂O₁₁ = 342 amu
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How many atoms does 2.0 moles of Helium (He) represent?
Answer:
12.044 × 10^23
Explanation:
Molecular mass is the sum of atomic masses of the elements present in a molecule. 12 gram of carbon that is one mole contains
6.022×10^23 atoms.
. It is called Avogadro's constant.
So, Number of particles = Given number of moles
×
Avogadro number.
Therefore, the number of atoms of He in 2.0 moles = 2.0×6.022×10^23 = 12.044×10^23
There are
12.044×10^23
atoms in 2.0 moles of Helium.
When sucrose is hydrolyzed, _____will be created as the glycosidic linkage is broken. Hydrolyzed sucrose_____. give a positive Benedict's test. Hydrolysis cbn be achieved by adding_____.
When sucrose is hydrolyzed, fructose and glucose will be created as the glycosidic linkage is broken. Hydrolyzed sucrose will give a positive Benedict's test. Hydrolysis can be achieved by adding dilute sulfuric acid.
What are the products of the hydrolysis of sucrose?Sucrose is a disaccharide sugar composed of glucose and fructose monomer units linked together by glycosidic bonds.
Because there are no free aldehyde groups, a sucrose molecule is not reducing.
Hydrolysis of sucrose yields fructose and glucose.
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Rank the the following parts of the EMS from shortest wavelength to longest wavelength. Input your answer as a 7 digit number (ex. 7654321)
1. visible light
2. ultraviolet
3. gamma rays
4. radio waves
5. x rays
6. microwaves
7. infrared
The order of the components of the electromagnetic spectrum from shortest wavelength to longest is as follows: 3-5-2-1-7-6-4.
What is electromagnetic spectrum?Electromagnetic spectrum is the entire range of wavelengths of all known electromagnetic radiations extending from gamma rays, to X-rays through visible light, infrared, to radio waves.
The components of the electromagnetic spectrum from order of shortest to longest wavelength is as follows;
Gamma raysX-raysUV radiationVisible lightInfrared lightMicrowavesRadio wavesThis suggests that gamma rays have the shortest wavelength while radio waves have the longest wavelength.
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Washing soda is used to make detergents and to remove minerals from water as part of a cleaning process. Write a chemical equation for what is occurring. What type of reaction is occurring?
By tying to the minerals in the water, washing soda "softens" the water so that detergents can more easily remove dirt from fabric. Coffee and tea stains on ceramics as well as grease from pots and pans can be eliminated with washing soda.
chemical reaction
Na₂CO₃ + 10H₂O → Na₂CO₃.10H₂O
Decomposition reaction involved in washing soda. Heat causes carbon dioxide and sodium oxide to decompose.
What happens when you use washing soda?Solvay's method is used to create washing soda. Sodium chloride, ammonia, and carbon dioxide react in water as part of Solvay's process. Calcium oxide is used to recover ammonia from ammonium chloride while calcium carbonate is used to produce carbon dioxide.
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