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4)
a)
Define the term relative atomic mass. ……………………………………………………………………………
………………………………………………………………………………………………………………………….
b)
Explain why
12
C is referred to in the definition. ………………………………………………………………….
………………………………………………………………………………………………………………………….
c)
(1)
Explain why carbon has a relative atomic mass of 12.011 and not exactly 12.000. ………………………...
………………………………………………………………………………………………………………………….
5)
(2)
(1)
In each case work out the limiting reagent and moles of ammonia formed (assuming complete reaction).
N2 + 3 H2  2 NH3
a)
5.00 moles of N2 + 5.00 moles of H2
moles of NH3 formed = …………..
(1)
b)
2.00 moles of N2 + 5.00 moles of H2
moles of NH3 formed = …………..
(1)
c)
10.0 moles of N2 + 50.0 moles of H2
moles of NH3 formed = …………..
(1)
d)
0.200 moles of N2 + 0.0500 moles of H2
moles of NH3 formed = …………..
(1)
6)
Calculate the volume of 0.200 moles of carbon dioxide at 100C and 2.00 MPa pressure.
………………………………………………………………………………………………………………………….
………………………………………………………………………………………………………………………….
………………………………………………………………………………………………………………………….
………………………………………………………………………………………………………………………….
(3)
3
7)
Calculate the number of moles of argon in 200 cm (3sf) at 100 kPa (3sf) at 20.0C.
………………………………………………………………………………………………………………………….
………………………………………………………………………………………………………………………….
………………………………………………………………………………………………………………………….
………………………………………………………………………………………………………………………….
8)
The equation is for the combustion of ethane in oxygen.
(3)
C2H6(g) + 3½ O2(g)  2 CO2(g) + 3 H2O(l)
What volume of carbon dioxide is formed and what is the total volume of gases at the end in each of the
following reactions.
a)
3
3
100 cm of ethane + 100 cm of oxygen
volume of CO2 formed = ………………….
b)
3
(2)
Total volume of gases at end = …………………….
(2)
Total volume of gases at end = …………………….
(2)
3
100 cm of ethane + 500 cm of oxygen
volume of CO2 formed = ………………….
c)
Total volume of gases at end = …………………….
3
3
200 cm of ethane + 400 cm of oxygen
volume of CO2 formed = ………………….
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18-Jun-2015
Chemsheets AS 1027
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