formula mass II

Front

What is the formula mass of a compound?

Back

The formula mass is the sum of the atomic masses of all atoms in a chemical formula, expressed in atomic mass units (amu).

Front

How do you determine the molar mass of a compound?

Back

To determine the molar mass, sum the atomic masses of each element in the compound, multiplied by the number of atoms of that element in the formula.

Front

What is the molar mass of carbon (C)?

Back

The molar mass of carbon is approximately 12.01 g/mol.

Front

What is the molar mass of oxygen (O)?

Back

The molar mass of oxygen is approximately 16.00 g/mol.

Front

What is the chemical formula for aluminum oxide?

Back

The chemical formula for aluminum oxide is Al2O3.

Front

How many atoms are in one molecule of water (H2O)?

Back

There are 3 atoms in one molecule of water: 2 hydrogen atoms and 1 oxygen atom.

Front

What is the significance of subscripts in a chemical formula?

Back

Subscripts indicate the number of atoms of each element in a molecule. For example, in H2O, the '2' indicates there are two hydrogen atoms.

Front

What is the molar mass of BF3?

Back

The molar mass of BF3 is 68 g/mol.

Front

How do you calculate the total number of atoms in a compound like B2(CO3)3?

Back

Count the number of atoms for each element: B=2, C=3, O=9 (3*3), total = 2 + 3 + 9 = 14 atoms.

Front

What is the formula for calculating the mass of one mole of a substance?

Back

The mass of one mole of a substance is equal to its molar mass in grams.