Stoichiometry Flashcard

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 a mole in chemistry?

Back

A mole is a unit of measurement used to express amounts of a chemical substance, defined as exactly 6.022 x 10²³ particles (atoms, molecules, etc.).

Front

How do you calculate the number of moles from mass?

Back

Number of moles = mass (g) / molar mass (g/mol).

Front

What is the balanced equation for the combustion of hydrogen?

Back

2 H₂ + O₂ → 2 H₂O.

Front

What is the mole ratio in a balanced chemical equation?

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 many moles of water are produced from 8 moles of hydrogen in the reaction 2 H₂ + O₂ → 2 H₂O?

Back

8 moles of water are produced.

Front

What is the molar mass of magnesium nitrate, Mg(NO₃)₂?

Back

The molar mass of Mg(NO₃)₂ is 148.313 g/mol.

Front

In the reaction 3 Mg + Fe₂O₃ → 3 MgO + 2 Fe, what is the mole ratio of MgO to Fe?

Back

The mole ratio of MgO to Fe is 3:2.

Front

What is the mole ratio of oxygen to water in the reaction 2 H₂ + O₂ → 2 H₂O?

Back

The mole ratio of oxygen to water is 1:2.

Front

How many moles of hydrogen are needed to react with 2 moles of nitrogen in the reaction N₂ + 3H₂ → 2NH₃?

Back

6 moles of hydrogen are needed.