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Question

What mass of Nitrogen, N2, will contain the same number of molecules as 1.8g of water, H2O?


Solution

Atomic mass of H2O is 18 grams

hence 1.8 gram H2O=1.8/18 moles=0.1 moles=0.1×6.022×10^23 molecules

for same number of N2 molecules we need 0.1 mole of N2

as 1 mole N2 has 28 gm mass

so 0.1 mole N2 will have=0.1×28 gram
=2.8 grams

hence we need 2.8 grams N2

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