Calculate the molecular mass of Ethylene ( $C_{2} H_{4}$ )

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Solution

The molecular mass of the substance is the sum of atomic masses of all the atoms in a molecule of the substance.
The molecular mass of $C_{2} H_{4}$ = $(2 \times A t o m i c m a s s o f C a r b o n) + (4 \times A t o m i c m a s s o f H y d r o g e n) = (2 \times 12) + (4 \times 1) = 28 u$

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