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 the amount of a substance, defined as containing exactly 6.022 x 10^23 particles (atoms, molecules, ions, etc.).

Front

What does a balanced chemical equation represent?

Back

A balanced chemical equation represents the conservation of mass, showing that the number of atoms of each element is the same on both sides of the equation.

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 molar mass of NaOH?

Back

The molar mass of NaOH (Sodium Hydroxide) is approximately 40 g/mol.

Front

In the reaction 2 Na + 2 H2O → 2 NaOH + H2, how many grams of hydrogen are produced from 120 g of Na?

Back

5.2 g of hydrogen are produced.

Front

What is the mole ratio of MgO to Fe in the reaction 3 Mg + 1 Fe2O3 → 3 MgO + 2 Fe?

Back

The mole ratio of MgO to Fe is 3 mol MgO / 2 mol Fe.

Front

How do you convert molecules to moles?

Back

To convert molecules to moles, use the formula: Moles = Number of molecules / Avogadro's number (6.022 x 10^23).

Front

If you have 1.20 x 10^22 molecules of Na, how many grams of hydrogen are produced?

Back

0.0201 grams of hydrogen are produced.

Front

In the reaction SiO2 + 3 C → SiC + 2 CO, how many liters of CO are produced from 8.0 moles of C?

Back

120 liters of carbon monoxide (CO) are produced.