Question

What is the numbers of molecules in 0.9 of steam .

Answer 1

Here's your answer

Asked is : number of molecules in 0.9g of steam

Solution:

Molecular weight of steam=18g

[atomic masses of O=16,H=1

Molecular weight=(1×2)+(16×1)

=2+16=18g]

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

0.9g of steam contains:

(0.9×6×10^23)/18

=3×10^22 molecules

Therefore,

Number of molecules in 0.9g of steam=3×10^22 molecules

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