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I know this is an old post but ima reply anyways. You know you need gravitational force. Gravitational force is inversely proportional to the square of the distance so therefore, at a distance of lets say 2x the force will be f/4 (2^2). if it was 3x it would be f/9, at distance r/2 it will be...

I don't know if this is right but this is what i did: a) ethylene - C2H4 MM = 28 Amount of C = 24 Amount of H = 4 therefore (780 * 4)/28 = 111.4t but C2H6 -> C2H4 + H2 (I think) therefore (1000-780)+111.4 = 331.4t