A crude oil sample contains 10 ppm water. What is the water concentration in (a) mg/L, (b) mM. density of oil = 0.87 g/ml, density of water = 1 g/ml, and average molecular weight of crude oil is 300...

A crude oil sample contains 10 ppm water. What is the water concentration in (a) mg/L,
(b) mM.  density of oil = 0.87 g/ml, density of water = 1 g/ml, and average molecular weight of crude oil is 300
g/mol. There are two answers. Give both and explicitly show the assumptions.