Review of Empirical and Molecular Formulas

Front

A compound consists of 72.2% magnesium (Mg) and 27.8% nitrogen (N) by mass. What is the empirical formula? Options: Mg₄N₃, MgN₂, Mg₃N₂ , MgN

Back

Mg₃N₂ 

Front

Find the empirical formula for the elements with percentages: 40.05% S and 59.95% O. Options: SO, SO2, SO3, SO4

Back

SO3

Front

Given the following: 42.07% Na, 18.89% P, and 39.04% O, determine the empirical formula.

Back

Na3PO4

Front

What is the molecular formula for a compound with the empirical formula: K₂SO₄ and a molecular mass of 696g? Options: K₂SO₄ , K₈SO₁₆, K₈S₄O₈ , K₈S₄O₁₆ 

Back

K₈S₄O₁₆ 

Front

What is the percent by mass of sodium in NaCl?

Back

39%

Front

A formula with the lowest whole # ratio of elements in a compound is called

Back

Empirical Formula 

Front

Empirical formula of Si₂F₆

Back

SiF₃

Front

What is the empirical formula for N₂S₃?

Back

N₂S₃

Front

Empirical formula of C₂F₆?

Back

CF₃

Front

A chemical formula that shows the actual # and kinds of atoms present in one molecule of a compound is called_________

Back

molecular formula