Calculate the mole fraction of MgCl2 in a solution created by dissolving 132.1g of MgCl2 in 175mL of water.

Question

Chemistry

Amelia Osborn

27 June, 18:07

Calculate the mole fraction of MgCl2 in a solution created by dissolving 132.1g of MgCl2 in 175mL of water.

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Answers (1)

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Gael · Answer 1

Mol fraction MgCl2 = 0.125

Explanation:

Step 1: Data given

Molar mass MgCl2 = 95.21 g/mol

Mass of MgCl2 = 132.1 grams

Volume of water = 175 mL

Density of water = 1g/mL

Molar mass H2O = 18.02 g/mol

Step 2: Calculate mass of water

Mass water = 1g/mL * 175 mL

Mass of water = 175 grams

Step 3: Calculate moles H2O

Moles H2O = mass H2O / molar mass H2O

Moles H2O = 175.0 grams / 18.02 g/mol

Moles H2O = 9.711 moles

Step 4: Calculate moles MgCl2

Moles MgCl2 = 132.1 grams / 95.21 g/mol

Moles MgCl2 = 1.387 moles

Step 5: Calculate total moles

Total moles = 9.711 moles + 1.387 moles

Total moles = 11.098 moles

Step 5: calculate mol fraction

Mol fraction water = 9.711 moles / 11.098 moles = 0.875

Mol fraction MgCl2 = 1.387 moles / 11.098 moles = 0.125

0.875 + 0.125 = 1