Question

Calculate the number of molecules present in :
(i) 1 kg oxygen.
(ii) 1 dm' of hydrogen at N.T.P.
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Answer 1

Hi Dear

Number of molecules in 1 kg of oxygen

are

• First calculate number of moles here moles are 1000/32 =31.25mol
• Now 1 mil has molecules 6.022 ×10^23 molecules so 31.25 will have 31.25×6.022×1023=1.88 ×10^25.

At S.T.P the volume of every gas is 22.4 Litre so to calculate number of moles convert the dm in to litre 1dm3=1litre

• now moles =1/22.4
• molecules =1×6.022×10^23/22.4= 2.4 × 10^22 .

hope it helps

Answer 2

I hope it's help you

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