Question

(1) How many Atoms are there in 4.2 moles of Ca ?

(2) Calculate the number of moles in 25g of Ca ( Ca = 40u)

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Answer 1

Answer:

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Answer 2

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How many Atoms are there in 4.2 moles of Ca?

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⟹$number \: of \: atoms = 4.2 \times 6.022 \times {10}^{23}$

⟹$25.2924 \times {10}^{23}$

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⟹Calculate the number of moles in 25g of Ca ( Ca = 40u) ??

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⟹$mass \: of \: ca = 25g$

⟹$atomic \: mass = 40u$

⟹$number \: of \: moles = \frac{given \: mass}{atomic \: mass}$

⟹$\frac{25}{40}$

⟹$0.625 \: moles$

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