Question

in 0.40 moles of H2s calculate 1)no.of molecules of H2s2)no.of atoms of H and S

Answer 1

hey your ans is here
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i). no of moles=0.40
now we know that
1 mole =6.02×10^23molecules/particles/atoms
0.40mole will contain
0.40×6.02×10^23molecules
=2.408×10^23molecules
ii). no of atoms of hydrogen in h2s are 2
so
6.02×2×10^23=12.04×10^23
no of atoms of sulphide is 1
so
6.02×1×10^23 atoms is sulphur
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important point to be noted is that when the no of mole is not mention take the value as
6.02×10^23
otherwise
6.023×10^23
hope it helps:-)