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  • C2H4 and C3H8 Hydrogen Mass Comparison

C2H4 and C3H8 Hydrogen Mass Comparison

On the comparison of the mass of hydrogen in ethylene and propane
Now we want to know which of the two $C_2H_4 $and $C_3H_8 $has the higher mass of hydrogen.

First look at $C_2H_4 $, its molar mass is $M_ {C_2H_4} = (12\ times2 + 1\ times4) g/mol = 28g/mol $, where the mass fraction of hydrogen is $w_ {H1} =\ frac {1\ times4} {28} =\ frac {1} {7} $.

Looking at $C_3H_8 $again, its molar mass is $M_ {C_3H_8} = (12\ times3 + 1\ times8) g/mol = 44g/mol $, and the mass fraction of hydrogen is $w_ {H2} =\ frac {1\ times8} {44} =\ frac {2} {11} $.

To compare the size of $\ frac {1} {7} $and $\ frac {2} {11} $, the common score can be obtained: $\ frac {1} {7} =\ frac {11} {77} $, $\ frac {2} {11} =\ frac {14} {77} $.

Because $\ frac {11} {77} <\ frac {14} {77} $, that is, $w_ {H1} < w_ {H2} $.

It can be seen that $C_2H_4 $and $C_3H_8 $of the same mass, $C_3H_8 $contain higher mass of hydrogen.