Mole conversions/Percent Composition/Molar Mass Exam

Front

What is the percent by mass of an element in a compound?

Back

The percent by mass of an element in a compound is the mass of the element divided by the total mass of the compound, multiplied by 100.

Front

How do you calculate the molar mass of a compound?

Back

To calculate the molar mass of a compound, sum the molar masses of all the atoms in the formula.

Front

What is the molar mass of Nitrogen (N)?

Back

The molar mass of Nitrogen (N) is 14.01 g/mol.

Front

What is the molar mass of N2?

Back

The molar mass of N2 is 28.02 g/mol.

Front

How many grams are in 1 mole of a substance?

Back

1 mole of a substance contains a mass equal to its molar mass in grams.

Front

What is the total number of atoms in a compound?

Back

The total number of atoms in a compound is found by adding the number of each type of atom present in the formula.

Front

How do you find the percent composition of a compound?

Back

Percent composition is found by dividing the mass of each element in the compound by the total mass of the compound and multiplying by 100.

Front

What is the formula for calculating the number of moles?

Back

Number of moles = mass (g) / molar mass (g/mol).

Front

What is the significance of the mole in chemistry?

Back

The mole is a fundamental unit in chemistry that represents 6.022 x 10^23 particles of a substance.

Front

How do you convert moles to grams?

Back

To convert moles to grams, multiply the number of moles by the molar mass of the substance.