How many carbon atoms in 77.28 g of ethan (C2H6) ?
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use molar mass to find moles: 77.28 g of ethane (C2H6) @ 1 mole / 30.07 grams C2H6 = 2.570 moles C2H6 2.570 moles C2H6 has twice as many carbon atoms ...
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77.28 grams C2H6 (1 mole C2H6/30.068 grams)(2 mole C/1 mole C2H6)(6.022 X 10^23/1 mole C)
= 3.096 X 10^24 atoms of carbon
= 3.096 X 10^24 atoms of carbon
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