| Date | May 2015 | Marks available | 1 | Reference code | 15M.1.sl.TZ2.1 |
| Level | SL | Paper | 1 | Time zone | TZ2 |
| Command term | Question number | 1 | Adapted from | N/A |
Question
What is the total number of protons and electrons in one mole of hydrogen gas?
A. 2
B. 4
C. \(1.2 \times {10^{24}}\)
D. \(2.4 \times {10^{24}}\)
Markscheme
D
Examiners report
This question was found to be difficult as many candidates did not add the number of protons to the number of electrons. They missed the word “total” in the stem. What was surprising was the percentage of candidates giving answer A (31%).
Syllabus sections
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