What is the concentration of ammonia in a solution made by dissolving 3.75 g of ammonia in 120.0 l of water?

Below are the choices that can be found elsewhere:

a) 7.05 M

b) 3.78*10^-2 M

c) 1.84*10^-3 M

d) 0.0313 M

e) 1.84 M

Below is the answer:

mol = mass/m. wt = 3.75/17.03 = 0.22 mol

Molarity = mol / Volume (L) = 0.22/120.0 = 1.84 * 10^-3

c) 1.84*10^-3 M