We’re being asked to calculate the **molarity (M)** of a solution of NH_{3}. Recall that ** molarity** is the ratio of the moles of solute and the volume of solution (in liters). In other words:

We first need to determine the number of moles of NH_{3} since this is the only information missing for us to find molarity. Notice that the volume of the solution in liters is already given.

We’re given the mass of NH_{3}, **17 g**. We can use the molar mass of NH_{3} to find the moles. The molar mass of NH_{3} is:

NH_{3}**1** N × 14 g/mol N = 14 g/mol

**3** H × 1 g/mol H = __3 __g__/mol __

** Sum = 17 g/mol**

What is the molarity of a solution that contains 17g of NH _{3} in 0.50 L of solution.

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