Part A Calculate the mass percent of a solution that is prepared by adding 57.0

Question

Part A

Calculate the mass percent of a solution that is prepared by adding 57.0 g of NaOH to 211 g of H2O.

Express your answer numerically.

Part B

Calculate the mass percent of a NaCl solution in which 177 g of NaCl is dissolved in 3.91 L of water at 25 C (density = 0.997 g/mL).

Express your answer numerically.

Part A

0.157 mol of sucrose in 642 mL of solution

Express your answer using three significant figures.

Part B

0.225 mol of KNO3 in 0.815 L of solution

Express your answer using three significant figures.

Part C

1.1 mol of KCl in 2.3 L of solution

Express your answer using two significant figures.

Explanation / Answer

A)

mass % of NaOH = mass of NaOH * 100 / total mass

= 57.0*100 / (57.0 + 211)

= 21.3 %

Answer: 21.3 %

B)

mass of NaCl = 177 g

volume of H2O = 3.91 L = 3910 mL

density= 0.997 g/mL

mass of H2O = density * volume

= 0.997 g/mL * 3910 mL

= 3898.27 g

mass % of NaCl = mass of NaCl * 100 / total mass

= 177*100 / (177 + 3898.27)

= 4.34 %

Answer: 4.34 %

I am allowed to answer only 1 question at a time

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