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What mass of ethylene (C2H4) contains the same number of carbon atoms as 288 g of neopentane (C5H12)?

1. 56 g
2. 280 g
3. 140 g
4. 560 g

Correct answer: 280 g

Solution

Neopentane is C5H12 with molar mass = 5*12 + 12*1 = 72 g/mol. Moles of neopentane = 288/72 = 4 mol. Each molecule has 5 carbon atoms, so total carbon = 4*5 = 20 mol carbon atoms. Ethylene C2H4 has 2 carbons per molecule. To get 20 mol carbon, we need 10 mol of C2H4. Molar mass of C2H4 = 2*12 + 4*1 = 28 g/mol. Mass = 10*28 = 280 g.

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