Average Atomic Mass Practice Problems

Quiz
•
Science
•
10th Grade
•
Hard
Standards-aligned
Lisa Thompson
FREE Resource
25 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
24.1% of all the isotopes of a an element have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu.
What is the average mass of this element?
74.92 amu
24.97 amu
75.01 amu
74.51 amu
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
4.35% of all X atoms have a mass of 39.946 amu. 83.79% have a mass of 41.941 amu, 9.50% have a mass of 42.941 amu, and 2.36% have a mass of 43.939 amu. What is the average atomic mass of atom X?
41.97 amu
42.19 amu
10.43 amu
40.04 amu
Tags
NGSS.MS-PS1-2
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Compute the average atomic mass for silicon:
27.977
28.09
28.976
The average mass cannot be determined from provided information.
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
24.1% of all the isotopes of a an element have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu.
How many protons does this element have?
32
33
34
no way to know
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What is the atomic mass of Sodium?
11
22.990
33.990
11.990
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What is the atomic mass of Gold?
79
196.97
79.97
275
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What is the atomic mass of "F"
9
18
17
19
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