13 January, 00:46

You added 5.00 mL of 0.40 M NaOH in methanol to 20.00 mL of cooking oil. Calculate the number of moles of vegetable oil, methanol, and NaOH that are initially present in the sample. Assume the density of vegetable oil is 0.895 g/mL and the molar mass is 895 g/mol. Look up the density and molar mass of any other compounds as needed.

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1. 13 January, 02:21
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Answer: 0.02 moles of vegetable oil, 0.002 moles of NaOH, 0.003 moles of methanol.

Explanation: First we need to know molarity M, is moles/liter. So solving for moles of vegetable oil first. We have 20mL vegetable oil and we want moles.

20.00mL • 0.895g/mL cancels out mL and gives us = 17.9g then we can divide by g/mol to get moles.

17.9g/895g/mol = 0.02moles of vegetable oil

Now with 5.00 mL of 0.40 M NaOH in methanol we solve for how many mL of each we have. First we'll change our mL to L.

5.00 mL • L/1000mL = 0.005L

Now 0.4 mol/L • 0.005L = 0.002 mol of NaOH

This means we have 0.6 • 0.005L = 0.003 mol of methanol.