2. Atoms & Elements

Calculating Molar Mass

2. Atoms & Elements

# Calculating Molar Mass - Video Tutorials & Practice Problems

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**Molar Mass** is a physical property that represents the mass of a substance divided by the amount of that substance.

Calculating Molar Mass

1

concept

## Calculating Molar Mass

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The units for molar mass are in grams per mole.

2

example

## Calculating Molar Mass Example 1

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3

Problem

ProblemCalculate the molecular weight of C_{3}H_{5}N_{3}O_{3}.

A

123.80 g/mol

B

131.10 g/mol

C

136.90 g/mol

D

147.10 g/mol

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Problem

ProblemThe reaction between nickel metal and hydrochloric acid is not a simple dissolution. The product formed is NiCl_{2} • 6 H_{2}O (s), nickel (II) chloride hexahydrate, which has exactly 6 waters of hydration in the crystal lattice for every nickel ion. What is the molar mass of nickel (II) chloride hexahydrate, NiCl_{2} • 6 H_{2}O (s)?

A

228.99 g/mol

B

231.01 g/mol

C

234.71 g/mol

D

237.69 g/mol

5

Problem

ProblemWhat is the molar mass of diazepam also known as Valium if 0.05570 mol weighs 15.86 g?

A

220.1 g/mol

B

241.4 g/mol

C

263.9 g/mol

D

284.7 g/mol

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