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3 years ago

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The mass of sample X is 20.0 g. It was placed in a graduated cylinder and the water level rose from A to B. What is the density

of sample X? Pay close attention to significant figures

1 answer:

Nadya [2.5K]3 years ago

3 0

Answer: 4.0 g/ml

Explanation:

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What is the molarity of a solution in which 7.1 g of sodium sulfate is dissolved in enough water to make 100. mL of solution?

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Explanation:

Given data

Mass of sodium sulfate (solute): 7.1 g

Volume of solution: 100 mL

Step 1: Calculate the moles of the solute

The molar mass of sodium sulfate is 142.04 g/mol. The moles corresponding to 7.1 grams of sodium sulfate are:

$7.1g \times \frac{1mol}{142.02g} = 0.050mol$

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We will use the relation 1 L = 1000 mL.

$100mL \times \frac{1L}{1000mL} =0.100L$

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