Chemical Quantities Review

Front

What is the formula for magnesium phosphide?

Back

Mg₃P₂

Front

What is the percent composition of Nitrogen in NO₂? (rounded)

Back

30%

Front

What is the formula for the compound formed by Ba⁺³ and Cl⁻?

Back

BaCl₃

Front

What is the percent composition of Oxygen in NO₂? (rounded)

Back

70%

Front

What is the formula for the compound formed by Potassium and Sulfur?

Back

K₂S

Front

Define percent composition in chemistry.

Back

Percent composition is the percentage by mass of each element in a compound.

Front

What is the molar mass of NO₂?

Back

46 g/mol

Front

How do you calculate the percent composition of an element in a compound?

Back

(mass of element in 1 mole of compound / molar mass of compound) x 100%

Front

What is the significance of the subscript in a chemical formula?

Back

Subscripts indicate the number of atoms of each element in a molecule.

Front

What is the formula for calculating moles from mass?

Back

Moles = mass (g) / molar mass (g/mol)