Flashcard Stoich Review

Front

What is stoichiometry?

Back

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

Front

What is a mole in chemistry?

Back

A mole is a unit of measurement used to express the amount of a substance, defined as containing exactly 6.022 x 10^23 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 molar mass of water (H2O)?

Back

The molar mass of water is approximately 18.02 g/mol.

Front

In the reaction 2H2 + O2 → 2H2O, how many moles of water are produced from 2 moles of oxygen?

Back

2 moles of oxygen produce 4 moles of water.

Front

What is the balanced equation for the reaction of sodium (Na) with water (H2O)?

Back

The balanced equation is 2Na + 2H2O → 2NaOH + H2.

Front

How do you find the percentage composition of an element in a compound?

Back

Percentage composition = (mass of element in 1 mole of compound / molar mass of compound) x 100%.

Front

What is the molar mass of calcium (Ca)?

Back

The molar mass of calcium is approximately 40.08 g/mol.

Front

How many grams are in 0.5 moles of sodium chloride (NaCl)?

Back

0.5 moles of NaCl is approximately 29.0 g.

Front

What is the coefficient of water in the balanced equation Na + H2O → NaOH + H2?

Back

The coefficient of water is 2.