On a sheet of paper, write the word from the Word Bank that completes each sente
ID: 999447 • Letter: O
Question
On a sheet of paper, write the word from the Word Bank that completes each sentence. The yield is an amount of product calculated from a balanced equation. The yield is an amount of product measured in a lab. The yield compares two amounts and tells how efficient a reaction is. On a sheet of paper, write the letter of the answer to each question. Use this equation 4NH_4 + 7O_2 right arrow 4 NO_2 + 6H_2O. Assume 17.5g of NH_2 reacts with excess oxygen. What mass of water should be produced according to stoichiometry? 18.5 g 27.8 g 175 g 313 g The answer to question 4 is the yield. percent actual theoretical measured This reaction is performed in a lab and 17.1 g of H_2O is measured. What is the percent yield of water? 61.5% 74.1% 83.3% 92.4% On a sheet of paper, write the answer to each question What does percent yield tell you about a reaction? Why is the percent yield for real reactions usually less than 100%?Explanation / Answer
1) The theoretical yield is an amount......
2) The actual yield is an amount......
3) The percent yield......
4) First find the amount of moles of NH3:
mol= mass/MW = 17.5g/17g/mol= 1.029mol
If we look at the balanced equation we can see that 4 moles of NH3 produces 6 moles of H2O, so, 1.029mol of NH3 will produce:
mol H2O produced= 1.029mol NH3 x 6mol H2O/4mol NH3 = 1.54mol
mass water= 1.54mol x 18g/mol= 27.79g= 27.8g
The correct option is B.
5) theoretical yield.
6) %yield= actual yield/theoretical yield x 100= 17.1g/27.8g x 100= 61.5%
7) looking at the percent yield you can tell the efficiency of the reaction. We always want a 100% yield because it means that the reaction produced the highest amount of product possible.
8) because there can be side reactions, we theoreticaly know that the reaction produces 1 product or 2, but sometimes it is not correct, and another reactions happen. Also the reagents can have impurities, this cause that the amount weighed of the pure reagent is less than the one required, because we are weighing the pure reagent and the impurity.
9) Sorry i can´t see the numbers :(
10) same problem as 9)
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