Unit 7.1 Moles & Molar Mass Review
Presentation
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Chemistry
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10th - 12th Grade
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Practice Problem
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Medium
Standards-aligned
Patrick Ashton
Used 28+ times
FREE Resource
8 Slides • 11 Questions
1
Unit 7.1 Moles & Molar Mass Review
2
Multiple Choice
How many particles are in a mole?
6022
6022 million
6022 moles
6.022 x 1023
3
1 Mole = 6.022 x 1023
You need to have this number memorized!
4
Multiple Choice
3.1 x 1024
8.6 x 10-24
5
When a question is asking for water molecules, the answer will be a very large number.
6
Multiple Choice
How many water molecules are in 1.2 moles of water?
1.9 x 1023
1.9 x 10-24
7.2 x 1023
7.2 x 10-24
7
Watch the Video linked to Schoology to the 2:00 mark to assist you with the last problem.
https://www.youtube.com/watch?v=kJQnOVk8k2A
8
Multiple Choice
How many moles of Francium (Fr) are in 7.4 x 1026 atoms?
1.23 moles
45 x 1049 moles
87 moles
1.2 x 103 moles Fr
9
Multiple Choice
0.75 particles
0.75 mol
2.7 x1047 mol
2.7 x1047 particles
10
Remember to divide by (6.022 x 1023) when given molecules/particles!
11
Multiple Choice
How many moles are in 3.7 x 1020 Sodium (Na) atoms?
6.1 x 10-4
2.2 x 1044
2.2 x 104
6.1 x 1044
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Continue the video from the 2 minute mark to the finish for assistance with the last problem.
https://www.youtube.com/watch?v=kJQnOVk8k2A
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Multiple Choice
In 2 moles of Ammonia NH4 there are 1.20 x 1024 molecules of ammonia. How many total atoms of Nitrogen are there in 2 moles of Ammonia?
1
1.20 x 1024
1.20 x 10-24
6.022 x 1023
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In 2 moles of Ammonia (NH4) there are 1.20 x 1024 molecules of ammonia. How many total atoms of Nitrogen are there in 2 moles of Ammonia?
These question are asking for the total number of atoms (still a BIG number) of a specific atom of a compound. So, in 1.24 x 1024 ammonia molecules, how many Nitrogen atoms are there? In order to find the number of Nitrogen atoms, multiply the total number of ammonia molecules by how many Nitrogen atoms there are in one ammonia.
(1.20 x 1024) x (1) = 1.20 x 1024
15
Multiple Choice
In 2 moles of Ammonia (NH4) there are 1.20 x 1024 molecules of ammonia. How many total atoms of Hydrogen are there in 2 moles of Ammonia?
4.80 x 1024
6.022 x 1023
3.00 x 1023
1.80 x 10-24
16
Multiple Choice
96 g/mol
130 g/mol
232.5 g/mol
303.3 g/mol
17
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
18
Multiple Choice
12 g/mol
16 g/mol
32 g/mol
44 g/mol
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Confused about Molar Mass? Look at yesterday's (Unit 7.2) slides and/or look at the video linked below.
https://www.youtube.com/watch?v=o3MMBO8WxjY
Unit 7.1 Moles & Molar Mass Review
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