Question

When NH₃ is prepared from 18 g N₂ and excess H₂, the theoretical yield of NH₃ is 22 g. When this reaction is carried out in a given experiment, only 18 g is produced. What is the percent yield?

A. 12%.
B. 81%.
C. 78%.
D. 82%.

Answer 1

The percent yield of NH3 when 18 g of the substance is produced instead of the theoretical 22 g is approximately 82%, making the correct answer D. 82%.

Step-by-step explanation:

When NH3 is prepared from 18 g N2 and excess H2, and the theoretical yield of NH3 is 22 g, but only 18 g is produced, the percent yield is calculated using the formula:

Percent Yield = (Actual Yield / Theoretical Yield) × 100%

Therefore, Percent Yield = (18 g / 22 g) × 100% = 81.81%, which can be rounded to 82%.

So, the correct answer is D. 82%.The percent yield is calculated by dividing the actual yield by the theoretical yield and multiplying by 100. In this case, the actual yield is 18 g and the theoretical yield is 22 g, so the percent yield can be calculated as (18 g / 22 g) * 100 = 81%. Therefore, the correct answer is B. 81%.