Question

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Answer 1

Answer:

Q1: c. 7.2 g.

Q2: a. 0.42 M.

Explanation:

Hello there!

In this case, according to the definition of molarity as moles of solute divided by volume of solution in liters, we can proceed as follows:

Q1: Here, given the molarity and volume we can calculate the moles of the sugar as follows:

$n=M*V=0.4mol/L*0.1L\\\\n=0.04 mol$

Next, since its molar mass is about 180 g/mol, the mass turns out:

$0.04mol*\frac{180g}{1mol} =7.2 g$

Therefore, the answer is c. 7.2 g.

Q2: Here, recalling the definition of molarity, we can just plug in the 0.629 moles and 1.500 L to obtain:

$M=\frac{0.629mol}{1.5L}\\\\M=0.42M$

Therefore, the answer is a. 0.42 M.

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