Answer:
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