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enthalpy of combustion question - please help!
this is a question from June 2005 - Unit 6 synoptic.
When 0.10g of propane was burned the quantitiy of heat evolved was 5.0kJ. The enthalpy of combustion of propane in kJmol-1 is:
A: -800
B: -1500
C: - 2200
D: - 2900
I keep getting C but the markscheme says B.
How would you do this calculation??
x
When 0.10g of propane was burned the quantitiy of heat evolved was 5.0kJ. The enthalpy of combustion of propane in kJmol-1 is:
A: -800
B: -1500
C: - 2200
D: - 2900
I keep getting C but the markscheme says B.
How would you do this calculation??
x
0.1g / 44 (Mr of propane) = 2.27 mmol gives out -5kJ
so 1000/2.27 x 5 = -2202kJ mol^-1
=> markscheme typo
so 1000/2.27 x 5 = -2202kJ mol^-1
=> markscheme typo
beckiestar
I keep getting C but the markscheme says B.
That's Question 1 and the markscheme says C.
Icy_Mikki
That's Question 1 and the markscheme says C.
lol
Icy_Mikki
That's Question 1 and the markscheme says C.
doh!
ok thanks guys!! see i'm sooo tired and stressed I can't even read straight! Which bodes brilliantly well for tomorrow!
multiple choice arn't always easy!
multiple choice is horrendous!! honestly guys, i would muuuch prefer a synoptic which isn't multiple choice - in fact we kinda have that as well on AQA as unit 5 is partly synoptic. We have 40 questions in 1 hour, and like Wenzel said, you have to do calculations and in depth working out for most of them. It's awful trust me!! 
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