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Calculate the no of moles in 64g oxygen and 12g helium

Posted by Anjali Dhankar 4 years, 7 months ago

CBSE > Class 09 > Science

4 answers

Sunil Dhankar 4 years, 7 months ago

Atomic mass of He =4u Molar mass of He = 4g The number of moles = given mass / molar mass n=m/M= 12/4 = 3 moles _

1Thank You

Nisha Setia 4 years, 7 months ago

No. of moles = given mass ----------------------- Gram atomic mass Given mass of oxygen is 64 g. And atomic mass of oxygen is 16u. So, gram atomic mass of oxygen is 16g. No. of moles = 64 -------. = 4 moles. 16 Given mass of helium is 12 g. And atomic mass of helium is 2u. So, gram atomic mass of helium is 12g. No. of moles = 12 -------. = 6 moles. 2

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꧁༒ Shaurya༻ 4 years, 7 months ago

Then , Moles of helium= 12/4(4is the molecular mass of helium) Moles of helium = 3u

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꧁༒ Shaurya༻ 4 years, 7 months ago

no of moles= given mass/ molecular mass Moles of oxygen= 64/ 16 =4u ( u=moles)

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