Answer:
[tex]C_{26}[/tex][tex]H_{21}[/tex][tex]O_{10}[/tex]
Explanation:
We are given the following percentages:
Carbon ------ 62.4%
Hydrogen ------------ 4.19%
Oxygen ---------------- 33.2%
Now, let's take a 100g sample of this compound
since percentages are calculated out of 100, you will notice that the mass of the elements in the sample is the same as their percent composition
So we have:
Carbon -------- 62.4 grams
Hydrogen ----------- 4.19 grams
Oxygen ------------ 33.2 grams
With this information, we can calculate the number of moles of the respective elements in the given compound
Moles of Carbon (mass = 12u):
Given mass / Molar mass = 62.4 / 12 = 5.2 moles
Moles of Hydrogen (mass = 1u):
Given mass / Molar mass = 4.19 / 1 = 4.2 moles (approx)
Moles of oxygen (mass = 16u):
Given mass / Molar mass = 33.2 / 16 = 2 moles
The ratio of moles of the respective elements in our compound:
(Moles of Carbon) : (Moles of Hydrogen) : (Moles of Oxygen)
5.2 : 4.2 : 2
Which can be written as: [tex]C_{5.12} H_{4.2} O_{2}[/tex]
We are almost done but there is one problem, the formulas of compounds we see have whole numbers and not decimals
So, we will multiply all 3 of the numbers by the smallest number possible to get whole number ratios
Since there are 2 numbers we need to take care of and both of them have 2 in the decimal place,
we can multiply by 5 to get whole number ratios
So we get:
26 : 21 : 10
Therefore the molecular formula of the compound:
[tex]C_{26}H_{21}O_{10}[/tex]
Question 2
0.83 pts
Given that the specific heat of copper metal is 0.377 J/(g °C), how much heat is required to
increase the temperature of 2.00 g of copper metal by 1.00 °C?
O 1.51 L
O 2.377
O 0.189 J
0.377 J
O 0.754 J
Question 3
0.83 pts
Answer:
Option e is correct
The heat required to increase the temperature of copper metal by 1 degree is 0.754 j .
Explanation:
Given data:
specific heat of copper = 0.377 j/g.°C
Heat required to increase temperature = ?
Mass of copper = 2.00 g
Change in temperature = 1°C
Solution:
Specific heat capacity:
It is the amount of heat required to raise the temperature of one gram of substance by one degree.
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
Q = m.c. ΔT
Q = 2 g× 0.377 j/g.°C × 1°C
Q = 0.754 j
The heat required to increase the temperature of copper metal by 1 degree is 0.754 j .
Match each term with its definition or description.
________ moles of solute per liter of solution
________moles of solute per kilogram of solvent
________mass of a substance per unit volume
________mass of a solute per mass of the total solution, multiplied by 100
________volume of a solute per volume of the total solution, multiplied by 100
a. molarity
b. weight percent
c. parts per billion
d. weight concentration
e. molality
f. Parts per billion
g. volume percent density
Answer:
a. molarity
e. molality
h. density
b. weight percent
g. volume percent
Explanation:
Molarity is defined as the number of moles of substance dissolved in per liter of solution (moles/Liter). It is also called molar concentration of the solution.
Molality is defined as the number of moles of substance dissolved in one kg or kilogram of solvent and its SI unit is mol/kg.
Density is defined as the mass divided by its volume.
density =mass/volume
Weight percent is defined as the division of mass of a solute to the mass of the total solution, multiplied by 100. To calculate the weight percent or mass percent, both mass of a solute and the mass of a solution is required to express the concentration of a solution.
Volume percent is defined as the ratio of the volume of the solute to the volume of the total solution multiplied by 100.
it is a way of thinking about the world, and is made up of a person's views and belief
Incomplete question. I inferred you want the term that fits this definition.
Answer:
A Worldview
Explanation:
Having a Worldview refers to an individual's perception or the way one thinks about the world, influenced by their attitudes and values.
This view of the world is made up of a person's views and beliefs which form their expectations about the world in which they live.
What is the mass number of the atom shown?
Answer:
21
Explanation:
Formula;
Mass number = number of protons + number of neutrons
= 9 + 12
= 21
Why must chemical equations be balanced?
A:So that the chemical reaction doesn't explode
B:The reaction won't happen until it is balanced
C:Matter cannot be created or destroyed in a chemical reaction
D:None of these
Answer:
to validate the law of conservation of mass as total no. of reactants must be equal to the total no. of products
The pale yellow liquid bromine pentafluoride reacts violently with water to give a mixture of bromic acid and hydrofluoric acid .
(a) Write a balanced chemical equation for this reaction.
BrF5 + 3H2O HBrO3 + 5HF
(b) Determine the concentration (in moles per liter) of each of the acids that result from the complete reaction of 5.40×10-2 moles of bromine pentafluoride with enough water to give a solution volume of 783 mL.
bromic acid : ________M
hydrofluoric acid : ___________M
Answer:
The concentration of bromic acid (HBrO₃) is 0.069 moles/L
the concentration of hydrofluoric acid (HF) is 0.345 moles/L
Explanation:
(a) The balanced chemical equation for the reaction is
BrF₅ + 3H₂O → HBrO₃ + 5HF
The chemical equation is balanced
(b) To determine the concentration of each acids,
First, we will determine the different volume of the acids yielded
The solution volume is 783 mL = 0.783 L
From the balanced chemical equation,
1 mole of BrF₅ produces 1 mole of HBrO₃
Likewise, 1 mole of BrF₅ will produce 5 moles of HF
From the question,
5.40×10⁻² moles of bromine pentafluoride (BrF₅) reacted;
Hence, 5.40×10⁻² moles of HBrO₃ will be produced
and 5 × 5.40×10⁻² moles of HF will be produced.
Number of moles of HBrO₃ produced = 5.40×10⁻² moles
and Number of moles of HF produced = 2.7 × 10⁻¹ moles
From the formula,
Number of moles (n) = Concentration (C) × Volume (V)
Then,
Concentration (C) = Number of moles (n) / Volume (V)
For bromic acid (HBrO₃)
n = 5.40×10⁻² moles
Volume = 0.783L
Hence,
C = 5.40×10⁻² moles / 0.783L
C = 0.069 moles/L
This is the concentration of bromic acid (HBrO₃)
For hydrofluoric acid (HF)
n = 2.7 × 10⁻¹ moles
V = 0.783L
Hence,
C = 2.7 × 10⁻¹ moles / 0.783L
C = 0.345 moles/L
This is the concentration of hydrofluoric acid (HF)
An organic compound of relative molecular mass 46,on analysis was found to contain 52.0% carbon, 13.3% hydrogen and 34.7% oxygen
(H=1,C=12,O=16)
calculate the empherical formulae and molecular formulae
Answer:
Empirical formula is C₂H₆O.
Explanation:
Empirical formula:
It is the simplest formula gives the ratio of atoms of different elements in small whole number
Given data:
Percentage of hydrogen = 13.3%
Percentage of carbon = 52.0%
Percentage of oxygen = 34.7%
Empirical formula = ?
Molecular formula = ?
Solution:
Number of gram atoms of H = 13.3 / 1.01 = 13 .17
Number of gram atoms of O = 34.7 / 16 = 2.17
Number of gram atoms of C = 52.0 / 12 = 4.3
Atomic ratio:
C : H : O
4.3/2.17 : 13.17/2.17 : 2.17/2.17
2 : 6 : 1
C : H : O = 2 : 6 : 1
Empirical formula is C₂H₆O.
Molecular formula:
Molecular formula = n (empirical formula)
n = molar mass of compound / empirical formula mass
n = 46 / 158
The relative molecular mass of compound is not correct.
You have an Iron atom with atomic mass 58 amu, how many neutrons
does it have?
Answer:
It has 32 neutrons
Explanation:
What conclusion about bonding can be drawn from these diagrams?
A) In ionic bonding the valence electrons are combined while the valence electrons are electrostatically portioned during non-polar covalent bonding.
B) The valence electrons are shared between both atoms in covalent bonding while the valence electrons are completely transferred in ionic bonding.
C) Valence electrons reside in a sea of electrons in metallic bonding while valence electrons are permanently exchanged during crystalline bonding.
D) During amorphous bonding the valence electrons are unevenly shared between the atoms while the valence electrons are borrowed in polar covalent bonding.
Answer:
It’s b
Explanation:
I just did it on usatestprep
The valence electrons are shared between both atoms in covalent bonding while the valence electrons are completely transferred in ionic bonding. Hence, option B is correct.
What is a bond?A chemical bond is what holds atoms together in molecules.
A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms.
These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding.
In the given diagram covalent bond is taking place.
Hence, option B is correct.
Learn more about the bond here:
https://brainly.com/question/14089750
#SPJ2
A balloon is filled with a gas and has a volume of 1.79 L at 2.82 atm pressure. What will its volume be if
the pressure is changed to 5.30 atm?
Answer:
The answer is 0.95 LExplanation:
In order to find the volume when the pressure is changed to 5.30 atm we use Boyle's law which is
[tex]P_1V_1 = P_2V_2 \\[/tex]
where
P1 is the initial pressure
P2 is the final pressure
V1 is the initial volume
V2 is the final volume
Since we are finding the final volume
[tex]V_2 = \frac{P_1V_1}{P_2} \\ [/tex]
From the question
P1 = 2.82 atm
V1 = 1.79 L
P2 = 5.30 atm
So we have
[tex]V_2 = \frac{2.82 \times 1.79}{5.3} \\ = 0.9524150943...[/tex]
We have the final answer as
0.95 LHope this helps you
Given that the frequency of a wave is 9.12x10^-12 Hz, what must be the
wavelength? KEEP THREE SIGNIFICANT FIGURES
Answer:
The wavelength of wave is 0.33 ×10²⁰ m.
Explanation:
Given data:
Frequency of wave = 9.12×10⁻¹² Hz
Wavelength of wave = ?
Solution:
Formula:
Speed of light = wavelength × frequency
c = λ × f
λ = c/f
This formula shows that both are inversely related to each other.
The speed of light is 3×10⁸ m/s
Frequency is taken in Hz.
It is the number of oscillations, wave of light make in one second.
Wavelength is designated as "λ" and it is the measured in meter. It is the distance between the two crust of two trough.
Now we will put the values in formula.
λ = 3×10⁸ m/s / 9.12×10⁻¹² Hz
Hz = s⁻¹
λ = 0.33 ×10²⁰ m
The wavelength of radiation is 0.33 ×10²⁰ m .
