Naturally Occurring Silicon Exists as Three Isotopes

question 69

Multiple Choice

Naturally occurring silicon exists as three isotopes.92.23% is Si-28 with a mass of 27.977 amu,4.67% is Si- 29 with a mass of 28.977 amu,and 3.10% is Si-30 with a mass of 29.974 amu.What is the atomic mass of silicon?

• A)14.00 amu
• B)28.09 amu
• C)28.98 amu
• D)86.93 amu

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