Calculation:
Mole fraction of H2O = Number of moles of H2O / Total number of moles (H2O +NaOH)
- Number of moles of H2O = 36/18
Number of moles of H2O =2 moles
- Number of moles of NaOH = 4/40
Number of moles of NaOH =0.1 mol
- Total number of moles = 2 + 0.1
Total number of moles = 2.1
- Mole fraction of H2O = 2/2.1
Mole fraction of H2O = 0.952
- Mole fraction of NaOH = 0.1/2.1
Mole fraction of NaOH = 0.048
- Mass of solution = Mass of H2O + Mass of NaOH
Mass of solution = 36+4
Mass of solution = 40g
- Volume of the solution = 40/1
Volume of the solution = 40mL
- Molarity of the solution = 0.1/0.04
Molarity of the solution = 2.5M