Mr(c3h6)=3*Ar(c)+6*Ar(h)=3*12+6*1=42
Mr(h2)=2*Ar(h)=2*1=2
DH2(c3h6)=Mr(c3h6):Mr(h2)=42:2=21
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Mr(c3h6)=3*Ar(c)+6*Ar(h)=3*12+6*1=42
Mr(h2)=2*Ar(h)=2*1=2
DH2(c3h6)=Mr(c3h6):Mr(h2)=42:2=21