A solution is prepared by adding 2 gof a substance A to 18 g of water. Calculate the mass per cent of the solute.

A solution is prepared by adding 2 g of a substance A to 18 g of water.  Mass per cent of A= Mass of A Mass of solution ×100                              =2g2g of A+18 g ofwater ×100                             =2 g20 g×100=10%