- Messages
- 59
- Reaction score
- 39
- Points
- 18
help needed in mcq 6,8,27 of may june 08....
For 6 I can only get the answer of 2.72 dm3 and the closest answer is 2.67 so I chose C which is correct. Just put the numbers into the ideal gas equation for 1/18 moles of H2O
101000 X V = .05555 X 8.31X 596 ----> V = 2.72 X 10-3 cubic meters or 2.72 dm3
8 is difficult and I don´t have time to explain all of the graphs. However A should be a graph for an inverse curve not a straight line. The other two are harder but for D in the equation PV = nRT if P is constant then V is directly proportional to T so D is correct.
27
Dehydration implies that the molecule is an alcohol, for it not to be susceptible to mild oxidizing agents then it must be a tertiary alcohol. So the -OH group is on the carbon next to ring that also has the methy group. Dehydration would produce molecule D.