chapter 12
How many grams of H3 PO4 are produced when 10.0 moles of water react with an excess of P4 O10? 653 g 6.7 g 1.22 g 147 g
653 g
In a particular reaction between copper metal and silver nitrate, 12.7 g Cu produced 38.1 g Ag. What is the percent yield of silver in this reaction? 88.2% 77.3% 176% 56.7%
88.2%
Glucose, C6 H12 O6 is a good source of food energy. When it reacts with oxygen, carbon dioxide and water are formed. How many liters of CO2are produced when 126 g of glucose completely react with oxygen? 15.4 L 5.43 L 94.1 L
94.1 L
Identify the limiting reagent and the volume of CO2formed when 11 L CS2 reacts with 18 L O2 to produce CO2 gas and SO2 gas at STP? O2 27, L CO2 O2 , 6.0 L CO2 CS2, 11 CO2
O2 , 6.0 L CO2
Which of the following is true about limiting and excess reagents? The amount of product obtained is determined by the limiting reagent. The reactant that has the smallest given mass is the limiting reagent. A balanced equation is not necessary to determine which reactant is the limiting reagent. Both reagents are left over after the reaction is complete.
The amount of product obtained is determined by the limiting reagent.
Which statement is true if 12 mol CO and 12 mol Fe2 O3 are allowed to react? The limiting reagent is CO and 8.0 mol Fe will be formed. The limiting reagent is CO and 3.0 mol CO2 will be formed The limiting reagent is Fe2 O3 and 36 mol CO2 will be formed
The limiting reagent is CO and 8.0 mol Fe will be formed.
In a chemical reaction, the mass of the products is equal to the mass of the reactants. has no relationship to the mass of the reactants. is greater than the mass of the reactants. is less than the mass of the reactants.
is equal to the mass of the reactants.
What is the first step in most stoichiometry problems? convert given quantities to volumes convert given quantities to moles add the coefficients of the reagents convert given quantities to masses
convert given quantities to moles
the reactant that is not completely used up in a reaction
excess reagent
What is the maximum number of grams of PH3 that can be formed when 6.2 g of phosophourus reacts with 4.0 g of hyrogen to form PH3? 270 g 45 g 6.8 g 0.43 g
6.8 g
How many grams of H3 PO4 are are produced when 10.0 moles of water react with an excess of P4 O10? 6.7 g 1.22 g 653 g 147g
653 g
How many moles of aluminum are needed to react completely with 1.2 mol of FeO? 1.2 mol 2.4 mol 0.8 mol 1.6 mol
0.8 mol
Which conversion factor do you use first to calculate the number of grams of CO2 produced by the reaction of 50.6 g of CH4 with O2 1 mol CH4/ 16.0 g CH4 2 mol O2/ 1mol CO2 44.0 g CO4/ 2 mol CO2 16.0 CH4/ 1 mol CO4
1 mol CH4/ 16.0 g CH4
How many moles of H3 PO4 are produced when 71.0 g P4 O10 reacts compleatly to form oxygen 16.0 mol 4.00 mol 1.00 mol
1.00 mol
How many moles of glucose, C6 H12 O6 can be "burned" biologically when 10.0 mol of oxygen is available? 53.3 mol 60.0 mol 1.67 mol 0.938 mol
1.67 mol
At STP, how many liters of oxygen are required to react completely with 3.6 liters of hydrogen to form water? 1.8 L 3.6 L 2.4 L 2.0 L
1.8 L
How many liters of hydrogen gas are needed to react with CS2 to produce 2.50 L of C4 at STP? 5.00 L 7.50 L 10.0 L 2.50 L
10.0 L
Metallic copper is formed when aluminum reacts with copper(II) sulfate. How many grams of metallic copper can be obtained when 54.0 g of Al react with 319 g of CuSO4? 127 g 381 g 21.2 g 162 g
127 g
How many grams of chromium are needed to react with an excess of CuSO4 to produce 27.0 g Cu? 81.5 g 33.2 g 18.0 g 14.7 g
14.7 g
How many grams of beryllium are needed to produce 36.0 g of hydrogen? (Assume an excess of water.) 36.0 g 162 g 324 g 4.00 g
162 g
In the reaction 2CO(g) + O2 g =2CO2 g what is the ratio ofmoles of oxygen used to moles of Co2 produced? 1:1 1:2 2:2 2:1
1:2
The equation below shows the decomposition of lead nitrate. How many grams of oxygen are produced when 11.5 g NO2 is formed? 2.00 g 1.00 g 32.0 g 2.88 g
2.00 g
How many liters of NH3 , at STP, will react with 5.3 g O2 to form NO2 and water? 0.004 23 L 6.49 L 3.03 L 2.12 L
2.12 L
Hydrogen gas can be produced by reacting aluminum with sulfuric acid. How many moles of sulfuric acid are needed to completely react with 15.0 mol of aluminum? 10.0 mol 22.5 mol 0.100 mol 15.0 mol
22.5 mol
Iron(III) oxide is formed when iron combines with oxygen in the air. How many grams of Fe2 O3 are formed when 16.7 g of Fe reacts completly with oxygen? 23.9 g 12.0 g 47.8 g 95.6 g
23.9 g
Aluminum reacts with sulfuric acid to produce aluminum sulfate and hydrogen gas. How many grams of aluminum sulfate would be formed if 250 g H4 SO4 completely reacted with aluminum? 290 g 870 g 450 g 0.85 g
290 g
If 1 egg and 1/3 cup of oil are needed for each bag of brownie mix, how many bags of brownie mix do you need if you want to use up 3 eggs and 1 cup of oil?
3
the amount of product formed when a reaction is carried out in the laboratory
actual yield
In a chemical reaction, the mass of the products is equal to the mass of the reactants. is less than the mass of the reactants. has no relationship to the mass of the reactants. is greater than the mass of the reactants.
is equal to the mass of the reactants.
the reactant that determines the amount of product that can be formed in a reaction
limiting reagent
This quantity can always be used in the same way as moles when interpreting balanced chemical equations.
number of molecules
the ratio of the actual yield to the theoretical yield
percent yield
Which statement is true if 12 mol CO and 12 mol Fe2 O3 are allowed to react? The limiting reagent is Fe2 O3 and 24 mol will be formed the limiting reagent is CO and 8.0 mol Fe will be formed. The limiting reagent is CO and 3.0 mol CO2 will be formed
the limiting reagent is CO and 8.0 mol Fe will be formed.
the maximum amount of product that could be formed from given amounts of reactants
theoretical yield
