How many moles of glucose are present in 1.0 L of a 2.5 M solution of glucose in water?

M = n / v

Where, M is molarity (M or mol/L), n is number of moles (mol) and v is the volume of the solution (L).

The molarity of given glucose solution is 2.5 M.

Volume is 1.0 L

Hence

2.5 M = n/1.0 L

n = 2.5 mol

Hence, number of moles of glucose in 1.0 L of 2.5 M solution is 2.5 mol.