How many moles are there in 4.00 g of ethanol,CH₃CH₂OH? A)0.00543 mol B)0.0870 mol C)11.5 mol D)184 mol

Question

Quizplus · Accepted Answer

To find the number of moles, we need to calculate the molecular weight of ethanol and divide the given mass by the calculated molecular weight. The molecular weight of ethanol is (2*12.01) + (6*1.01) + 16.00 = 46.07 g/mol. 
Now, moles of ethanol = given mass/molecular weight = 4.00/46.07 = 0.0870 mol (approx). Therefore, choice B is the correct answer.

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