Molar Mass

Front

What is molar mass?

Back

Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). It is calculated by summing the atomic masses of all atoms in a molecule.

Front

How do you calculate the molar mass of a compound?

Back

To calculate the molar mass, identify the number of each type of atom in the compound, multiply by the atomic mass of each element, and sum the total.

Front

What is the molar mass of water (H₂O)?

Back

The molar mass of water is 18.02 g/mol (2 hydrogen atoms at 1.01 g/mol each and 1 oxygen atom at 16.00 g/mol).

Front

Calculate the molar mass of NaCl.

Back

The molar mass of NaCl is 58.44 g/mol (sodium: 22.99 g/mol + chlorine: 35.45 g/mol).

Front

What is the significance of molar mass in stoichiometry?

Back

Molar mass is used to convert between grams and moles in chemical reactions, allowing for the calculation of reactants and products.

Front

How many moles are in 100 grams of NaCl?

Back

To find moles, divide the mass by the molar mass: 100 g / 58.44 g/mol = 1.71 moles.

Front

What is the molar mass of sulfuric acid (H₂SO₄)?

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The molar mass of sulfuric acid is 98.08 g/mol (2 hydrogen: 2.02 g/mol, 1 sulfur: 32.07 g/mol, 4 oxygen: 64.00 g/mol).

Front

How many oxygen atoms are in 2 moles of Mg(OH)₂?

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There are 4 oxygen atoms in 2 moles of Mg(OH)₂ (2 moles x 2 oxygen atoms per mole).

Front

What is the molar mass of ammonium sulfate ((NH₄)₂SO₄)?

Back

The molar mass of ammonium sulfate is 132.14 g/mol (2 nitrogen: 28.02 g/mol, 8 hydrogen: 8.06 g/mol, 1 sulfur: 32.07 g/mol, 4 oxygen: 64.00 g/mol).

Front

Calculate the molar mass of potassium nitrate (KNO₃).

Back

The molar mass of potassium nitrate is 101.10 g/mol (potassium: 39.10 g/mol, nitrogen: 14.01 g/mol, 3 oxygen: 48.00 g/mol).