Question

how many moles of solute are contained in a 250 ml solution that has a concentration of.85 m?

A) 210
B)0.21
C)3.4
D)0.29
E)0.85

Answer 1

Volume = 250 mL in liters : 250 / 1000 => 0.25 L

Molarity = 0.85 M

Number of moles:

n = M x V

n = 0.85 x 0.25

n = 0.21 moles

Choice B