How much water must be removed by steam distillation to recover this natural product from 3.0 g of a spice that contains 10% of the desired substance?

2.7 g of water must be removed. The spice weighs 3g originally and 10% is the desired product, = 0.3 g. 3.0g - 0.3g is equal to 2.7 g of water that needs to be removed.

Answer) by studying proton collisions hope this : )

It shows that the experiment is designed properly.