Stoichiometry review

Front

What is stoichiometry?

Back

Stoichiometry is the branch of chemistry that deals with the calculation of reactants and products in chemical reactions based on the conservation of mass.

Front

What is the mole ratio in a chemical reaction?

Back

The mole ratio is the ratio of the coefficients of the reactants and products in a balanced chemical equation, which indicates the proportion in which substances react and are produced.

Front

How do you calculate the number of moles from grams?

Back

To calculate the number of moles from grams, use the formula: moles = mass (g) / molar mass (g/mol).

Front

What is the balanced equation for the decomposition of potassium chlorate (KClO3)?

Back

2 KClO3 → 2 KCl + 3 O2.

Front

How many moles of oxygen are produced from the decomposition of 6.7 moles of KClO3?

Back

10.1 moles of oxygen are produced.

Front

What is the balanced equation for the reaction of sodium with water?

Back

2 Na + 2 H2O → 2 NaOH + H2.

Front

How do you convert moles of a substance to grams?

Back

To convert moles to grams, use the formula: mass (g) = moles × molar mass (g/mol).

Front

What is the molar mass of hydrogen (H)?

Back

The molar mass of hydrogen is approximately 1.01 g/mol.

Front

In the reaction Fe2O3 + 3H2 → 2Fe + 3H2O, how many moles of iron can be produced from 6 moles of H2?

Back

4 moles of iron can be produced.

Front

What is the significance of balancing a chemical equation?

Back

Balancing a chemical equation ensures that the law of conservation of mass is obeyed, meaning the number of atoms of each element is the same on both sides of the equation.