The atomic mass and abundance of Cr-50 is 49.946 amu and 4.3%. The atomic mass and abundance of Cr-52 is 51.941 amu and 83.8%. The atomic mass and abundance of Cr-53 is 52.941 amu and 9.5%. The atomic mass and abundance of Cr-54 is 53.939 amu and 2.4%. Which is the average atomic mass of chromium?

a. 53.94 amu

b. 52.19 amu

c. 52.00 amu

d. 51.94 amu

Question

Chemistry

Cadence Pittman

20 June, 01:44

The atomic mass and abundance of Cr-50 is 49.946 amu and 4.3%. The atomic mass and abundance of Cr-52 is 51.941 amu and 83.8%. The atomic mass and abundance of Cr-53 is 52.941 amu and 9.5%. The atomic mass and abundance of Cr-54 is 53.939 amu and 2.4%. Which is the average atomic mass of chromium?

a. 53.94 amu

b. 52.19 amu

c. 52.00 amu

d. 51.94 amu

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Answers (1)

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Multiply the mass by the abundance and add each. Make sure to convert the percentage into a decimal. (49.946 *.043) + (51.941 *.838) + (52.941 *.095) + (53.939 *.024) = 51.99 round up using sig figs and the answer is c. 52.00 amu