The Isotope Lithium-7 Has a Mass of 7

question 94

Multiple Choice

The isotope lithium-7 has a mass of 7.0160 atomic mass units,and the isotope lithium-6 has a mass of 6.0151 atomic mass units.Given the information that 92.58 percent of all lithium atoms found in nature are lithium-7 and 7.42 percent are lithium-6,calculate the atomic mass of lithium,Li (atomic number 3) .

• A)7.0160 amu
• B)6.942 amu
• C)6.495 amu
• D)13.031 amu

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