You can measure the effectiveness of your procedure and technique by looking at

Question

You can measure the effectiveness of your procedure and technique by looking at the percent yield. This compares the quantity of product actually collected (actual yield) to the amount that should be produced in an ideal world (theoretical yield). The theoretical yield is obtained by doing the relevant calculations while the actual yield is measured when the experiment is done in the laboratory. (For the problems in this class, the actual yield will be given.) The percent yield is calculated using the formula: Percent yield = actual yield/theoretical yield times 100 Elemental nitrogen can be produced by the reaction of ammonia (NH_3) with nitrous oxide (NO): 4NH_3 (g) + 6 NO(g) rightarrow 5 N_2 (g) + 6 H_2 O(g) a. If 10.0 g of NH_3 react, what is the theoretical yield of N_2 (in grams)? b. If the actual yield of N_2 is 8.50 g, what is the percent yield for the experiment?

Explanation / Answer

The balance reaction is for formation of N2 is as follows:

4 NH3 + 6 NO = 5 N2 + 6 H2O

First calculate the moles of NH3 in 10.0 g as follows:

Number of moles = 10.0 g / molar mass

= 10.0g / 17.031 g / mole

= 0.587 moles NH3

Now calculate the moles of N2 as follows:

0.587 moles NH3 * 5 mole N2 / 4 mole NH3

= 0.734 Moles N2

Amount of N2

= 0.734 Moles N2 *28.013 g / moles

= 20.55 g

Percentage yield = observed yield / theatrical yield *100

= 8.50 g /20.55 g*100

= 41.4%

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