How many moles are in a sample of ethanol, CH₃CH₂OH that has a volume of 100.0 mL? The molar mass and density of ethanol are 46.07 g/mol and 0.789 g/mL, respectively.

Question

Quizplus · Accepted Answer

We can use the formula:

moles = mass / molar mass

First, we need to find the mass of the ethanol in the given volume:

mass = volume x density
mass = 100.0 mL x 0.789 g/mL
mass = 78.9 g

Next, we can calculate the moles using the formula above:

moles = 78.9 g / 46.07 g/mol
moles = 1.71 mol

Therefore, the answer is B. There are 1.71 moles in the sample of ethanol.

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