Question

Given: Ammonia NH3
Determine the mass of hydrogen in a 2.50-gram sample of ammonia.
Show work using dimensional analysis:

Answer 1

Answer:

$\large \boxed{\text{0.44 g}}}$

Step-by-step explanation:

1. Calculate the molar mass of ammonia

1 N  = 1 × 14.01   g = 14.01   g

3 H = 3 ×  1.008 g = 3.024  

                 TOTAL = 17.03 g

2. Calculate the mass of hydrogen

So, there are 3.024 g of H in 17.03 g of NH₃.

The conversion factor is either

$\dfrac{\text{3.024 g H}}{\text{17.03 g NH}_{3}} \text{ or } \dfrac{\text{17.03 g NH}_{3}}{\text{3.024 g H}}$

We want to find grams of H, so we choose the first one.

$\text{Mass of H} = \text{2.5 g NH}_{3} \times \dfrac{\text{3.024 g H}}{\text{17.03 g NH}_{3}} = \textbf{0.44 g H}\\\\\text{The mass of H is \large \boxed{\textbf{0.44 g}} }$