Chapter 8 - Molar Conversions Part 2

Presentation

•

Chemistry

•

10th Grade

•

Easy

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NGSS

HS-PS1-7

Standards-aligned

Lynda Leibowitz

Used 1+ times

FREE Resource

7 Slides • 15 Questions

Chapter 8 - Molar Conversions Part 2

by Lynda Leibowitz

Now that you know how to do molar conversions with an element, let's give it a try with compounds.

The main difference is going to be the need to calculate the molar mass.

Practice calculating molar mass by answering the following questions.

Multiple Choice

What is the molar mass of table salt (NaCl)?

116.886 g/mol

35.453 g/mol

22.990 g/mol

58.443 g/mol

Multiple Choice

What is the molar mass of CO₂?

Multiple Choice

Calculate the molar mass of Ba(C₂H₃O₂)₂

255.3 g/mol

237.3 g/mol

228.3 g/mol

196.3 g/mol

Multiple Choice

Calculate the molar mass of NH₄NO₂

50 g/mol

60 g/mol

64 g/mol

78 g/mol

Now that you recall how to calculate molar mass we will do molar conversions with compounds.

REMEMBER --> Now if you are using the flowchart to multiply or divide by molar mass you will need to calculate it first!!

Here is the flowchart again. Please use your copy to answer the following questions.

Multiple Choice

What is the mass of 6.25 mol of Cu(NO₃)₂?

126 g

785 g

625 g

1172 g

Multiple Choice

What is the mass of 2.50 mol of oxygen gas O₂?

40.0 g

80.0 g

16.0 g

32.0 g

Multiple Choice

How many grams are in 3.3 mol of Potassium Sulfide, $K_2S$ ?

360 g

454 g

238 g

132 g

Multiple Choice

How many moles are in 20 grams of CaO?

0.357

0.56

1.22

Multiple Choice

How many atoms are there in 67.2 grams of lead (II) chloride, $PbCl_2$ ?

$3.11\ x\ 10^{24}$

$1.45\ x\ 10^{23}$

$6.02\ x\ 10^{23}$

$5.52\ x\ 10^{23}$

Multiple Choice

If I have 9.88 x 10²³ atoms of CO₂, what is the mass?

44.0 g

2.65 x10²³ g

1.37 x10²² g

72.2 g

Multiple Choice

How many atoms of carbon are in 6.00g of carbon?

1.20x10²⁴atoms C

6.02x10²³atoms C

3.01x10²³atoms C

1.50x10²³atoms C

Multiple Choice

How many grams are in 1.2 x 10²⁴ molecules of carbon monoxide, CO?

28 grams

56 grams

6.02 grams

1.2 grams

Multiple Choice

What is the mass of 0.89 mol of CaCl₂?

111 grams

0.008 grams

98.9 grams

none of the choices

Multiple Choice

True or False: One mole of Sulfur has 2.35 x 10¹⁴ atoms.

True

False

Multiple Choice

How many moles are in 50 grams of Calcium Bromide, CaBr₂?

0.75

1.25

0.25

0.55

Chapter 8 - Molar Conversions Part 2

by Lynda Leibowitz

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