Stoich Exam

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

How do you calculate the molar mass of a compound?

Back

To calculate the molar mass, sum the atomic masses of all the atoms in the compound's formula. For example, for C6H12O6, it is 6(12.01) + 12(1.008) + 6(16.00) = 180.18 g/mol.

Front

What is the mole concept in chemistry?

Back

The mole is a unit that measures the amount of substance. One mole contains approximately 6.022 x 10^23 particles (atoms, molecules, etc.).

Front

How do you convert grams to moles?

Back

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

Front

What is the balanced equation for the formation of sodium chloride?

Back

The balanced equation is: 2Na + Cl2 → 2NaCl.

Front

If 4 moles of NaCl are produced, how many moles of Cl2 are required?

Back

2 moles of Cl2 are required, according to the balanced equation 2Na + Cl2 → 2NaCl.

Front

What is the molar mass of NaOH?

Back

The molar mass of NaOH is approximately 40 g/mol (Na: 23 g/mol, O: 16 g/mol, H: 1 g/mol).

Front

How many moles are in 85.0 g of NaOH?

Back

To find moles: moles = 85.0 g / 40 g/mol = 2.1 moles.

Front

What is the formula to find the number of moles from mass?

Back

The formula is: moles = mass (g) / molar mass (g/mol).

Front

How do you find the number of grams from moles?

Back

To find grams from moles, use the formula: grams = moles x molar mass (g/mol).