H2S moles = 5.25
1) calculation for H2S
molecules
1 mole of H2S contain 6.023 x 10^23 molecules
        5.25 moles H2S
contain howmany molecules ?
H2S molecules = 5.25 x 6.023 x 10^23
  H2S molecules    Â
= 3.16 x 10^24
H2S -------------------------->Â Â 2
HÂ Â Â Â Â Â Â Â Â Â Â Â
+ S
5.25Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
2 x
5.25Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
5.25
5 .25 moles H2S contain  10.5 moles H and 5.25 moles
S
2) calculation for H
atoms
1 mole contain --------------------------> 6.03 x 10^23
atoms
10.5 mole -------------------------------? Â
H atoms = 6.023 x 10^23 x10.5
              Â
= 6.32 x 10^24
3) calculation for S
atoms
1 mole contain --------------------------> 6.03 x 10^23
atoms
5.25 mole -------------------------------? Â
S atoms = 6.023 x 10^23 x 5.25
              Â
=3.16 x 10^24
