Which of the following contain same number of carbon atoms as in 6 g o

1.	Which of the following contain same number of carbon atoms as in 6 g of carbon-12?
Answer» 7.5 G ethane 8 g METHANE both (a) and (b) none of these Solution :No. of moles of CARBON present in 6 g of C-12 = Mass / Molar mass = 6/12 = 0.5 moles = `0.5 xx 6.022 xx 10^(23)` carbon atoms. No. of moles in 8 g of methane = 8 /16 = 0.5 moles ` = 0.5 xx 6.022 xx 10^(23)` carbon atoms. No. of moles in 7.5 g of ethane = 7.5 / 16 - 0.25 moles = `2 xx 0.25 xx 6.022 xx 10^(23)` carbon atoms

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