When nitrogen and hydrogen react they form ammonia gas which has the formula NH 3 If 560 g of nitrogen are used up in the reaction how many grams of ammonia will be produced Episode 802 ID: 498488
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Slide1
Challenge Problem
When nitrogen and hydrogen react, they form ammonia gas, which has the formula NH3. If 56.0 g of nitrogen are used up in the reaction, how many grams of ammonia will be produced?
Episode 802
N2 (g) + 3H2 (g) 2NH3 (g)
? g NH3 = 56.0 g N2
28g N2
1 mol N2
1 mol N2
1 mol NH3
2 mol NH3
17g NH3
= 68g NH3Slide2
Sodium metal reacts with oxygen to produce solid sodium oxide. How many grams of sodium must react to produce
42.0 grams of sodium oxide?
When 12.0
grams of hydrogen reacts with oxygen, how many grams of water are produced?4Na (s) + O2 (g) 2Na2O (s)
2H2 (g) + O2 (g)
2H2O (l)
? g Na = 42.0g Na2O
62g Na2
O1 mol Na2
O2 mol Na2
O4 mol Na
1 mol Na
23g Na
= 31g Na
? g H
2
O = 12.0g H
2
2g H
2
1 mol H
2
2
mol H
2
2
mol H
2
O
1
mol H
2
O
18g H
2
O
= 108g H
2
O
Episode
802Slide3
Actual Yield
Amount of product produced when the reaction is performed in a
labTheoretical YieldAmount of product
expected to be produced based on the balanced equation and the amount of reactantsCalculated using stoichiometryPercent Yield(actual
yield/theoretical yield) x 100%Episode 802Slide4
Percent Yield in Lab
Actual yield of CO2 =
0.13g(from lab data)Calculated theoretical yield
from the balanced equation:NaHCO3 + HCl NaCl + CO2
+ H2O? g CO2 = 0.23g NaCO
384g NaCO
3
1mol NaCO3
1mol NaCO31mol CO
21mol CO2
44g CO2
= 0.12g CO
2
% yield =
0.13g
0.12g
x
100 =
108%
Episode
802Slide5
What is the % yield of carbon dioxide when 5.99 grams of propane are burned and 12.052 grams of carbon dioxide are collected?
C
3H8 + 5O
2 3CO2 + 4H2O? g CO
2 = 5.99g C3H8
44g C
3H8
1 mol C3
H8
1 mol C3
H8
3 mol CO2
1 mol CO
2
44g CO
2
= 17.97g CO
2
% yield =
12.052g
17.97g
x
100 =
67%
Episode
802