2A: Mass, % Composition, Empirical/Molecular Formula

Calculate the mass of calcium carbonate. Make sure to have the correct formula.

• 100.1 g/mol
• 68.34 g/mol
• 300.3 g/mol
• 124.1 g/mol

What are the units for molar mass?

• grams
• amu
• grams/mole
• liters

What is the mass of one mole of aluminum chloride (remember to determine the correct formula first)?

• 62.435g
• 116.399g
• 133.341g
• 97.888g

Tags

NGSS.HS-PS1-7

Find the percentage composition of  Mg in Mg₃(PO₄)₂.
   

• 27.75% Mg
• 23.57% Mg
• 48.68% Mg
• 13.45% Mg

Tags

NGSS.HS-PS1-7

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

Find the percent composition of hydrogen in (NH₄)₂S.

• 11.8%
• 41.1%
• 47.1%

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

• SO
• SO₂
• SO₃
• SO₄

What is the molecular formula if the empirical formula is C₂H₅ and the molecular molar mass is 58.14 g/mol?

• C₂H₅
• C₄H₁₀
• C₁H_2.5
• C₄H₈

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

• empirical formula
• chemical formula
• covalent formula
• molecular formula

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

• ionic formula
• covalent formula
• empirical formula
• molecular formula