Molar Mass and Formula Mass Calculations

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

Find formula mass of Mg₃(PO₄)₂.

• 363.97

• 262.87

• 335.8

• 238.5

Find the formula mass of N₂S₂ .

• 23

• 46

• 92.16

• 86.99

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

• 11.8%
• 41.1%
• 47.1%

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

• Molecular Formula
• Chemical Formula
• Empirical Formula 
• Distance Formula

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

• NO

• N₂O₄

• N₂O₃

• N₂O₅

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.)

• SO

• SO₂

• SO₃

• SO₄

Tags

NGSS.HS-PS1-7

Which one is an empirical formula?

• H₂O₂
• C₂H₆O₁₂
• CaCl₂
• N₂O₈

Empirical Formula for Br₂O₆

• BrO₃

• Br₆O₂

• BrO

• Br₂O₆

Tags

NGSS.HS-PS1-7