Question

How many moles and how many atoms are there in 10 grams of calcium?
(Atomic weight of Ca=40)
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Answer 1

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Number of moles = 40/10 = 4

Number of atoms = 6.023 * 10^23 / 4

= 1.5055 * 10^23

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Answer 2

Answer:

10g of calcium(cl)

GAM of cl = (1×40)g = 40g

:. No. of moles = Given mass/Molar mass

= (12/40)

= 0.3 moles

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