Question

Calculate the number of molecules present in 250 g of H20

Answer 1

Explanation:

molecular mass of H2O-

H=1u, O=16u

do,mass of water molecule

1×2+16

18u

now,no. of moles = mass in grams/ molar mass

so,no. of moles = 250/18 = 13.3 moles

now no. of molecules = no.of moles × avagadro number.

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