Question

For each of the following solutions, calculate the specified value.Calculate the number of grams of 3.9 % (m/m) NaCl solution that contains 7.20 g of NaCl .Express your answer to two significant figures and include the appropriate units.

Answer 1

Step 1

It is known that a value of "x" % (m/m) means:

"x" grams in 100 grams of solution

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Step 2

Information provided:

3.9 % (m/m) of NaCl solution

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Step 3

Procedure:

According to step 1, it is known that:

3.9 % (m/m) => 3.9 g NaCl in 100 g

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Now,

3.9 g NaCl ------------ 100 g of solution

7.20 NaCl ------------- X

X = 7.20 NaCl x 100 g of solution/3.9 g NaCl

X = 184.61 g = 180 g approx.

Answer: 180 g of solution