Stoich Practice

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, used to convert between moles of different substances.

Front

How do you calculate the mass of a reactant needed in a reaction?

Back

To calculate the mass of a reactant needed, use the balanced equation to find the mole ratio, convert the mass of the known substance to moles, and then use the mole ratio to find the moles of the unknown substance. Finally, convert moles back to mass.

Front

What is the balanced equation for the combustion of diborane (B2H6)?

Back

B2H6 + 3O2 → 2HBO2 + 2H2O.

Front

How many moles of water are produced from 4 moles of ammonia (NH3)?

Back

18 moles of water are produced from 12 moles of NH3 based on the reaction 4NH3 + 5O2 → 4NO + 6H2O.

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.

Front

What is the formula to convert grams to moles?

Back

Moles = mass (g) / molar mass (g/mol).

Front

What is the molar mass of O2?

Back

The molar mass of O2 (oxygen gas) is approximately 32 g/mol.

Front

In the reaction N2 + 3H2 → 2NH3, what is the mole ratio of N2 to NH3?

Back

The mole ratio of N2 to NH3 is 1:2.

Front

How many grams of O2 are needed to burn 36.1 g of B2H6?

Back

124 g of O2 are needed to burn 36.1 g of B2H6.