Question

a compound contains 36% of carbon ,by mass .If each molecule contains two carbon atoms,the no. of molecules of compound in it 10g is​

Answer 1

Answer:

0.3

Explanation:

So 36% by mass of 10g is Carbon i.e it weights a total of 3.6g.

And mass of carbon in 1 molecule = 12 amu.

Mass of carbon in 1 mole = 12g

No. of moles = 3.6 /12 = 0.3 .

Hence the numbers of moles asked here is 0.3

Answer 2

The compound contains 36% of carbon ,by mass.

so 3.6 g carbon is present in 10 g compound .

Mass of 1 mol carbon = 12 g

each molecule contain 2 carbon atoms .

so number of mole of compound = 3.6/(12×2) = 0.15

so no. of molecules= 0.15 × 6.022×10²³

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