What is the mole fraction of solute in a 3.12 m aqueous solution?

3.12 m of X is 3.12 moles X in 1000 g H2Omoles H2O = 1000 g x 1 mole/18 g = 55.55 moles

Total moles = 55.55 + 3.12 = 58.67 moles

mole fraction X = 3.12/58.67 = 0.053