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2% by mass of carbon means
100g of compound has 2 g of carbon.
There should be atleast one atom of carbon (for condition of minimum molecular mass of compound, as we know carbon is present and it cannot be present in fraction)
So 1 atom of carbon= 12 grams.
So there is actually 12 grams of carbon present in the compound, which should be 2% of the total molecular mass.
(2 × X )/100 = 12
X = 1200/2
X = 600g (minimum molecular weight)
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