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Q.

Number of Hydrogen atoms per molecule  of a hydrocarbon A having 85.5% Carbon is _____ (molar mass of A=84gr mole-1)

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answer is 12.

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Detailed Solution

100 gm hydrocarbon has (100-85.5) moles of H- atoms.

84 gm hydrocarbon contains = 84 x 14.5/100  atoms.

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