Mole Test Review

Which list of number for the atoms in Mg(NO₃)₂ is right?

• Mg = 1, N = 6, O = 6

• Mg = 1, N = 6, O = 2

• Mg = 2, N = 2, O = 6

• Mg = 1, N = 2, O = 6

How many O's are in Al₂(SO₄)₃

• 4

• 12

• 7

• 24

What is the molar mass of NaOH?

• 39.997 g/mol

• 38.989 g/mol

• 23.998 g/mol

• 57.004 g/mol

What is the molar mass of Ca(OH)₂

• 74.1 g/mol

• 210.0 g/mol

• 98.9 g/mol

• 219.9 g/mol

Find the percent composition of each element in N₂S₂

• 69.6% N, 30.4% S

• 15.2% N, 84.8% S

• 30.4% N, 69.6% S

• 65.2% N, 34.8% S

What is the mass percentage of carbon in carbon dioxide?

• 27.3%

• 42.9%

• 57.1%

• 72.7%

You are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements.

• SO

• SO₂

• SO₃

• SO₄

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

• NaPO₂

• Na₂PO₃

• Na₃PO₄

• NaPO₄

What is the empirical formula if you have 36.84% nitrogen and 63.16% oxygen?

• N₂O₅

• N₂O₄

• NO

• N₂O₃

You are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements. (keep two decimal places throughout calculations)

• SO₂

• SO

• SO₄

• SO₃