Carbon Dioxide and Magnesium Atom
Chemistry NYA/701 practise questions test 1 autumn 2012
Audrey Goldner-Sauvé
#1 Assuming a magnesium atom is spherical, calculate its volume in nm3. The diameter of a magnesium atom is 3.20 Å . The volume of a sphere is V = (4/3) r3. 1 Å = 1 x 10–10 m and 1 nm = 1 x 10–9 m and = 3.14
#2 What is the maximum amount of carbon dioxide that can be produced by the combustion of 0.450g of C2H5OH?
#3 What mass of FeCl3 would contain the same total number of ions as 16.8 g of Al2(SO4)3?
#4 Heating MgSO4•7H2O at 150°C produces MgSO4•xH2O. If heating 24.4 g of pure MgSO4•7H2O at 150°C were to give 13.7 g of pure MgSO4•xH2O, calculate the value for x.
(a) 5 (b) 4 (c) 3 (d) 2 (e) 1
#5 A sample of lead ore has a density of 8.80 g/mL. It is composed of two lead compounds: lead oxide, PbO (density 9.10 g/mL) and lead selenide, PbS (density 8.10 g/mL). What is the percent of the ore is lead oxide?
#6 A mixture of 13.1 g Zn and 22.0 g I2 is reacted to completion in a closed, evacuated container. What are the contents of the container after this reaction? Zn + I2 ZnI2
#7 If a reaction of 5.0 g of hydrogen with 5.0 g of carbon monoxide produced 4.5 g of methanol, what was the percent yield? 2H2 + CO CH3OH
(a) 11% (b) 79% (c) 96% (d) 24% (e) 63%
#8 In the sequential reactions shown below, the first reaction has an 80% yield and the second reaction has a 60% yield. A + B C + D C + E F
What is the yield of F?
answers 1 | 1.71 x 10-2 nm3 | 2 | 0.860 g carbon dioxide | 3 | 9.99 g iron III chloride | 4 | x = 1 | 5 | 70% lead II oxide | 6 | 7.42 g Zn and 27.64 g zinc iodide | 7 | 79 % yield | 8 | 48% yield
Audrey Goldner-Sauvé
#1 Assuming a magnesium atom is spherical, calculate its volume in nm3. The diameter of a magnesium atom is 3.20 Å . The volume of a sphere is V = (4/3) r3. 1 Å = 1 x 10–10 m and 1 nm = 1 x 10–9 m and = 3.14
#2 What is the maximum amount of carbon dioxide that can be produced by the combustion of 0.450g of C2H5OH?
#3 What mass of FeCl3 would contain the same total number of ions as 16.8 g of Al2(SO4)3?
#4 Heating MgSO4•7H2O at 150°C produces MgSO4•xH2O. If heating 24.4 g of pure MgSO4•7H2O at 150°C were to give 13.7 g of pure MgSO4•xH2O, calculate the value for x.
(a) 5 (b) 4 (c) 3 (d) 2 (e) 1
#5 A sample of lead ore has a density of 8.80 g/mL. It is composed of two lead compounds: lead oxide, PbO (density 9.10 g/mL) and lead selenide, PbS (density 8.10 g/mL). What is the percent of the ore is lead oxide?
#6 A mixture of 13.1 g Zn and 22.0 g I2 is reacted to completion in a closed, evacuated container. What are the contents of the container after this reaction? Zn + I2 ZnI2
#7 If a reaction of 5.0 g of hydrogen with 5.0 g of carbon monoxide produced 4.5 g of methanol, what was the percent yield? 2H2 + CO CH3OH
(a) 11% (b) 79% (c) 96% (d) 24% (e) 63%
#8 In the sequential reactions shown below, the first reaction has an 80% yield and the second reaction has a 60% yield. A + B C + D C + E F
What is the yield of F?
answers 1 | 1.71 x 10-2 nm3 | 2 | 0.860 g carbon dioxide | 3 | 9.99 g iron III chloride | 4 | x = 1 | 5 | 70% lead II oxide | 6 | 7.42 g Zn and 27.64 g zinc iodide | 7 | 79 % yield | 8 | 48% yield