Answer to Question #244062 in Physics for Durban

Question

A solution contains 5grams of glucose per 100milliliters. Each mole of glucose weighs 180grams. How many moles are there in 200milliliters of the glucose solution

Answer 1

100 ml weigh 5 g, 200 ml weigh 2 times more, or 10 g. The molar weight M is 180 g/mol. Find how many moles of glucose there are in m=10 g (or 200 ml) of glucose:

$$n=\frac{m}{M}=0.0556\text{ mol}.$$