Question

What is the number of molecules number in 9.0g of steam?

Answer 1

Here's your answer

Asked : number of molecules in 9.0g of steam

Solution:

Molecular weight of steam=18g

[(1×2)+(16×1)]

18g of steam contains 6×10^23 molecules (Avogadro's number)

9g of steam contains:

(9×6×10^23)/18

=3×10^22 molecules

Therefore,

9g of steam contains 3×10^22 molecules

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