Average Atomic Mass Calculations

Calculate the average atomic mass for neon given its natural abundance: 90.5% neon-20, 0.3% neon-21, and 9.2% neon-22.

• 20.18 amu

• 20.17 amu

• 20.19 amu

• 20.20 amu

Calculate the average atomic mass for iron with 15.2% iron-55 and 84.8% iron-56.

• 55.8 amu

• 55.9 amu

• 56.0 amu

• 56.1 amu

Calculate the average atomic mass of element X and identify it using the periodic table.

• Element A

• Element B

• Element C

• Element D

Tags

NGSS.MS-PS1-1

Calculate the average atomic mass of silver if 13 out of 25 atoms are silver-107 and 12 out of 25 atoms are silver-109.

• 107.5

• 108.0

• 108.5

• 109.0

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

An element exists as the three isotopes shown. What is the average atomic mass?

• 20.74 amu

• 22.56 amu

• 18.39 amu

• 24.31

Titanium has five common isotopes: 46Ti (8.25%), 47Ti (7.44%). 48Ti (73.72%), 49Ti  (5.41%), 50Ti (5.18%). What is the average atomic mass of titanium?  

• 45.7936 amu

• 47.8669 amu

• 48.2571 amu

• 46.9883 amu

Calculate the average atomic mass of silver.

• 106.38649amu

• 111.91896amu

• 107.8677amu

• 121

What is the average atomic mass of the element based on its isotopes?

• 24.25 amu

• 36.25 amu

• 24.00 amu

• 12.25 amu

Tags

NGSS.HS-PS1-7

NGSS.HS-PS1-8

What is the average atomic mass of an element with isotopes of 60% mass 35 amu and 40% mass 37 amu?

• 35.8 amu

• 36.0 amu

• 36.2 amu

• 35.5 amu