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Question
Calculate the mass of 3.011 × 1024 atoms of carbon.
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Solution
Number of carbon atoms = 3.011 × 1024
We know that 12g (atomic mass of carbon) of carbon contains 6.022 × 1023 carbon atoms.
Mass of 1 atom of carbon = 12/6.022 × 1023 = 1.99 × 10-23
Hence, mass of 3.011 × 1024 carbon atoms = 3.011 × 1024 ×1.99 × 10-23 = 59.9g or 60g (approximately)
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