JEE Main · 2020 · 04 Sep 2020 · Shift 1 · Some Basic Concepts of Chemistry

The mass of ammonia in grams produced when 2.8 kg of dinitrogen quantitatively reacts with 1 kg of dihydrogen is ____.

Answer: 3400

Solution

The reaction is

N X_{2} + 3 H X_{2} 2 NH X_{3}

. The amounts taken are

\frac{2800}{28} = 100

mol of

N X_{2}

and

\frac{1000}{2} = 500

mol of

H X_{2}

. Since

100

mol

N X_{2}

needs only

300

mol

H X_{2}

while

500

mol is available, nitrogen is the limiting reagent. It yields

2 \times 100 = 200

mol of

NH X_{3}

, whose mass is

200 \times 17 = 3400

JEE Main · 2020 · 04 Sep 2020 · Shift 1 · Integer answer