test 1 autumn 2012
#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
What is the maximum amount of carbon dioxide that can be produced by the combustion of 0.450g of C2H5OH?
What mass of FeCl3 would contain the same total number of ions as 16.8 g of Al2(SO4)3?
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
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?
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
#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?
| 1.71 x 10-2 nm3
| 0.860 g carbon dioxide
| 9.99 g iron III chloride
| x = 1
| 70% lead II oxide
| 7.42 g Zn and 27.64 g zinc iodide
| 79 % yield
| 48% yield
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