DP Chemistry (last assessment 2024)
Question 19M.3.hl.TZ1.15b(i)
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.3.hl.TZ1.15b(i) |
| Level | hl | Paper | 3 | Time zone | TZ1 |
| Command term | Calculate | Question number | b(i) | Adapted from | N/A |
b(i).
[Maximum mark: 1]
19M.3.hl.TZ1.15b(i)
Natural gas is an energy source composed mainly of methane.
Natural gas is burned to produce steam which turns turbines in an electricity generating power plant.
The efficiency of several sources for power plants is given below.
(b(i))
Calculate the maximum electric energy output, in MJ, which can be obtained from burning 1.00 kg of methane by using your answer from (a).
[1]
Markscheme
«55.5 MJ × 58 % =» 32.2 «MJ» [✔]
Examiners report
Calculations of specific energy of methane and the maximum electric energy output in parts (a) and (b)(i) were done well.
