2.5 moles of oxygen will be produced.
What is the mole ratio?A stoichiometric problem can be characterized by two features: the information given in the problem and the information to be solved called the unknown. Both the given and the unknown can be reactants, both products, or one can be a reactant and the other a product. Quantities of substances can be expressed in moles. However, in laboratory situations, it is common to determine the amount of a substance by determining the mass of the substance in grams. The amount of gaseous substance can be expressed in terms of its volume. This concept focuses on the type of problem where both the given quantity and the unknown quantity are expressed in moles.
The molar ratio is a conversion factor that relates the molar amounts of any two substances in a chemical reaction. The numerical value of the conversion factor is obtained from the coefficients of the balanced chemical equation.
For the given reaction:
2H₂O₂ → 2H₂O + O₂
This reaction indicates that the mole ratio of H₂O₂ to O₂ is 2:1 i.e. for every two moles of H₂O₂ one mole of O₂ is produced.
So, for 5.0 moles of hydrogen peroxide, moles of oxygen will be half of 5.0, which is 2.5 moles.
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Addison warms a pure solid substance in a system closed off from the surroundings
This experiment shows that the elements of pure solid substance in a system closed off from the surroundings has increased temperature very fast.
What is a pure solid substance?Pure substances are substances that are built up of only one kind of particle and have a fixed or abiding structure. Pure substances are further confidential as elements and compounds. An element is a substance that comprises only one type or kind of atom. a pure substance has a constant chemical composition.
No affair where you sample a substance, it is the same. For chemistry, the safest examples of pure substances are elements and compounds. So, examples cover gold, silver, helium, sodium chloride, and pure water.
So we can conclude that In chemistry, a pure substance is an element or compound made up of one type of particle.
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23. When wood burns, only a small amount of ashes are made. We know that matter cannot be created or
destroyed. Explain why the mass of the wood before the fire does not equal the mass of the ashes after the
reaction.
for each
The mass of wood before burning does not always equal the mass of the resulting ashes after burning because some other products have been produced and lost.
Burning of woodWhen wood burns, a form of chemical change takes place and the reaction is reversible.
The products of wood burning include ashes, carbon dioxide, and water vapor. However, only ashes remain after burning because carbon dioxide and water vapor both escape into the atmosphere.
The escape of some of the products of burning into the atmosphere is one of the reasons the reaction seems to negate the law of conservation of mass.
According to the law of conservation of mass, masses are conserved during reactions but can be converted to different forms. Thus, if ashes were to be the only product of the burning of wood, then the mass of the ashes formed must be equivalent to the mass of the wood.
However, due to the formation of other products that happen to always escape into the air, the mass of ashes is not always equal to the mass of the woods that burn.
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Calculate the molar it’s of a phosphoric acid solution if 34.21mL of 0.0431M sodium hydroxide neutralizes 25.00mL of the acid solution
According to the concept of molar concentration, the molarity of phosphoric acid solution is 0.0589 M.
What is molar concentration?Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.
The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.
In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.In case where two solutions are given, molarity of one solution is obtained as, M₁V₁=M₂V₂
Substitution in above formula gives, 0.0431×34.21/25=0.0589 M.
Thus the molarity of phosphoric acid is 0.0589 M.
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A 2.00 gram sample of a glazed donut was placed in a bomb calorimeter with a heat capacity of 3.54 kcal/°C. The sample was completely burned, causing the temperature of the calorimeter to rise by 2.02 °C. How many kilocalories of energy were stored in the donut sample?
A 2.00 gram sample of a glazed donut was placed in a bomb calorimeter with a heat capacity of 3.54 kcal/°C. The sample was completely burned, causing the temperature of the calorimeter to rise by 2.02 °C. kilocalories of energy were stored in the sample is 14.30 kcal.
given that :
mass = 2 g
heat capacity = 3.54 kcal / °C
change in temperature = 2.02 °C
The heat energy expression is given as :
Q = mc ΔT
Q = 2 g × 3.54 kcal / °C × 2.02 °C
Q = 14.30 kcal
Thus, A 2.00 gram sample of a glazed donut was placed in a bomb calorimeter with a heat capacity of 3.54 kcal/°C. The sample was completely burned, causing the temperature of the calorimeter to rise by 2.02 °C. kilocalories of energy were stored in the sample is 14.30 kcal.
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What is the pH of a solution that is 0.21 M sodium fluoride and 0.57 M hydrofluoric acid?
From the Henderson- Hasselbalch equation, the pH of a solution is 3.36.
How can the pH of a solution made from a weak acid and its conjugate base be calculated?The pH of a solution made from a weak acid and its conjugate base can be calculated using the Henderson- Hasselbalch equation.
The Henderson- Hasselbalch equation is given below as follows:
pH = pKₐ + log ([A⁻]/[HA])where;
pKa = - log(Ka) of hydrofluoric acid[A⁻] = concentration of salt of conjugate base, NaF[HA] = concentration of hydrofluoric acidpKa of HF = 3.8
[A⁻] = 0.21 M
[HA] = 0.57 M
pH = 3.8 + log (0.21/0.57)
pH = 3.36
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Which functional groups are present in carbohydrates?
alkenes, alkynes, and phenyl groups
ethers, esters, and amides
carboxylic acids and amino groups
aldehydes, ketones, and hydroxyl groups
The functional groups are present in the carbohydrates is aldehydes , ketone , and hydroxyl groups.
Carbohydrates are the essential for living thing . they provide energy to living things. simple carbohydrates are : monosaccharides , disaccharides, oligosaccharides. Carbohydrates involves in fat metabolism. carbohydrates are also called as starch , simple sugars etc. carbohydrates found in foods . sugar is a source of carbohydrates. there are good carbohydrates which is high in nutrients moderate in calories. the bad carbohydrates are low in nutrients and high in calories.
Thus, The functional groups are present in the carbohydrates is aldehydes , ketone , and hydroxyl groups.
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Can someone help me please
The number of moles of F₂ is 0.453 mol
The grams of F₂ are present is 17.21 g
given that :
pressure P = 5.2 atm
volume V = 2.55 L
temperature T = ( 273 + 83 ) = 356 K
using the gas equation , we get
PV = nRT
n = PV / RT
n = ( 5.2 × 2.55 ) / (0.0821 × 356)
n = 13.26 / 29.22
n = 0.453 mol
the mass of F₂ = moles × molar mas
= 0.453 × 38
= 17.21 g
Thus, The number of moles of F₂ is 0.453 mol
The grams of F₂ are present is 17.21 g
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What order is the typical sequence of events in the scientific method?
The typical sequence of events in the scientific method is to define question , make prediction, collect data, analyze data, Experiment, test hypothesis, draw conclusion , report result.
the following are the steps in the scientific method :
1) first step to define a question for the investigation.
2) Then make prediction : do some research related to the question and the study related theories.
3)collect the data : collect all the data from the research .
4) analyze the data
5) experiments : perform the experiments
6) test the hypothesis: accept or reject hypothesis.
7) draw the conclusion
8) report your result.
Thus , The typical sequence of events in the scientific method is to define question , make prediction, collect data, analyze data, experiments , test hypothesis, draw conclusion , report result.
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Which of the following best describes temperature:
A: number of molecules
B:motion of molecules
C:size of molecules
D:type of molecules
joules to warm 59.5 mL of water ( density=1.00g/mL ) from 26.5 ∘C to 100 ∘C and vaporize it at 100 ∘C
Knowing the heat capacity of the water, we know that the heat absorbed is 1.83 * 10^4 J.
What is the heat of the water?We know that water can be able to absorb heat when it is heated and the heat that is absorbed can be able to change the state of the water. We are now going to see how we can be able to obtain the heat that is absorbed by the water.
Then;
H = mcdT
H = heat absorbed
m = mass of the water
c = heat capacity of water
dT = temperature change
Given that mass of the water = 59.5 g we can write;
H = 59.5 g * 4.18 * (100 ∘C - 26.5 ∘C)
H = 1.83 * 10^4 J
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