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Arte-miy333 [17]
3 years ago
12

What is the molarity of sodium chloride in solution that is 13.0% by mass sodium chloride and that has a density of 1.10 g/mL?

Chemistry
1 answer:
Andrej [43]3 years ago
8 0

Answer:

molarity: 2.4 M

Explanation:

1. Suppose you have 100 mL de solution:

Use density to find grams of soluton:

100 mL solution x (1.10 g / 1 mL) = 110 g solution

2. FInd the amount of sodium chloride pure:

110 g solution x(13 g NaCl / 100 g solution) = 14.3 g NaCl

3. Change grams to mol:

14.3 g NaCl x ( 1 mol NaCl/ 58.44 g NaCl) = 0.24 mol NaCl

4. Molarity:

M = mol NaCl / L solution

M = 0.24 mol NaCl / 0.1 L = 2.4 M

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A saturated solution of calcium hydroxide contains 1.85 g of solute in 100. mL of solution. What is its molarity
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Answer:

M=0.250M

Explanation:

Hello!

In this case, since the molarity of a solution is computed by dividing the moles of solute by the volume of solution in liters, we first need to compute the moles of solute knowing that the molar mass of calcium hydroxide is 74.1 g/mol as follows:

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Best regards!

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