i just have a handout homework needs solve
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extra_credit-chem_123.pdf
Extra credit Chem 123
1. Given the following reaction: Na2S2O3 + AgBr à NaBr + Ag2S2O3 a. How many moles of Na2S2O3 are needed to react completely with 42.7 g of
AgBr?
b. What is the mass of NaBr that will be produced from 42.7 g of AgBr?
2. Calculate the mass (in kg) of water produced from the combustion of 1.0 gallon (3.8 L) of gasoline (C8H18). The density of gasoline is 0.79 g/mL. Balance the reaction!
_____C8H18 + ______O2 à _____CO2 + _____H2O
3. KO2 is used in a closed-‐system breathing apparatus. It removes carbon dioxide and water from exhaled air. The reaction for the removal of water is:
_____KO2 + ____H2O à ____O2 + ____KOH a. What mass of KO2 produces 235 g of O2?
The KOH produced is used to remove carbon dioxide by the following reaction: KOH + CO2 à KHCO3.
b. What mass of CO2 can be removed by 123 g of KO2?
Name:_____________________________________________
Extra credit Chem 123
4. PbS(s) + 4 HNO3(aq) à Pb(NO3)2(aq) + S(s) + 2 NO2(g) + 2 H2O(l)
4.756 g of lead (II) sulfide reacts with 55.83 mL of 4.004 M nitric acid and 0.4271 g of sulfur are produced and isolated (actual product). What is the percent yield? Hint: this is a limiting reactant problem.
5. The average human requires 120.0 grams of glucose (C6H12O6) per day. How many grams of CO2 (in the photosynthesis reaction) are required to react with this amount of glucose? The photosynthetic reaction is: 6 CO2 + 6 H2O -‐-‐-‐> C6H12O6 + 6 O2
Extra credit Chem 123
6. Given the following equation: Cu + 2 AgNO3 -‐-‐-‐> Cu(NO3)2 + 2 Ag. a. How many atoms of Cu are needed to react with 3.50 moles of AgNO3?
b. If 89.5 grams of Ag were produced, how many grams of Cu reacted?
7. 4 S(s) + CH4(g) + 2 H2O(l) -‐-‐-‐-‐-‐> 4 H2S(g) + CO2(g). How many g of H2S can be made from 120 µg of CH4?
8. Given the following equation: 2 KClO3 -‐-‐-‐> 2 KCl + 3 O2. How many decigrams (10dg = 1 g) of O2 can be produced by letting 7.226 x 1024 formula units of KClO3 react?
Extra credit Chem 123
9. The human body needs at least 1.03 x 10-‐2 mol O2 every minute. If all of this oxygen is used for the cellular respiration reaction that breaks down glucose, how many grams of glucose does the human body consume each minute?
C6H12O6(s) + 6 O2(g) -‐-‐-‐-‐-‐> 6 CO2(g) + 6 H2O(l)
10. 90.0 g of FeCl3 reacts with 52.0 g of H2S. What is the limiting reactant? What is the mass of HCl produced? What mass of excess reactant remains after the reaction? The reaction is a precipitation reaction _____FeCl3 (aq)+ ______H2S (aq) à _____Fe2S3 (s) + _____HCl (aq)
