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Question

What is the relative atomic mass and atomic mass of calcium?


A
40.0,40 u
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B
39.90,40.078 u
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C
40.078,40.078 u
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D
40.078,41.0 u
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Solution

The correct option is C 40.078,40.078 u
Relative atomic mass of an element (R.A.M) =Mass of one atom of the element112th×mass of C12atom
Relative atomic mass of Ca=40.078
Atomic mass of Ca=R.A.M×1 amu=40.078 amu

Chemistry

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