2.4 Calculating Average Atomic Mass
Authored by Brandon Milam
Science
12th Grade
NGSS covered
Used 16+ times
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5 questions
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1.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Magnesium exists as three isotopes shown above. What is the average atomic mass?
18.39 amu
20.74 amu
22.56 amu
24.31 amu
2.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
An element has two naturally occurring isotopes. One is 10.013 amu and is 19.9% abundant. The other is 11.01 amu and is 80.1% abundant. What is the average atomic mass? What element is it?
9.012, Beryllium
12.011, Carbon
6.941, Lithium
10.812, Boron
3.
MULTIPLE CHOICE QUESTION
5 mins • 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
4.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Compute the average atomic mass for silicon:
27.977
28.09
28.976
The average mass cannot be determined from provided information.
Tags
NGSS.MS-PS1-1
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Calculate the average atomic mass of silver.
106.38649amu
111.91896amu
107.8677amu
121
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