Mass of one atom of calcium is:

40 × 6.02 × 10²³

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20 g

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40 g

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Solution

Explanation:
The mass of one atom is the same as the molar mass of the compound.
Mass of 6.022 x 10²³atoms of calcium = Gram atomic mass of calcium i.e. 40 g.
Hence, option (C) is correct.

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