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Wt. Of 1mole ethane 12*2+1*6=30gm wt. Of 2.5 Mole of ethane 30*2.5=75gm
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Molecular mass of ethane=2x12+1x6=30
no of moles=given mass/molecular mass
2.5=given mass/30
given mass=2.5x30=75 g
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