DP Chemistry (first assessment 2025)
Question 22N.1A.SL.TZ0.3
| Date | November 2022 | Marks available | [Maximum mark: 1] | Reference code | 22N.1A.SL.TZ0.3 |
| Level | SL | Paper | 1A | Time zone | TZ0 |
| Command term | Solve | Question number | 3 | Adapted from | N/A |
3.
[Maximum mark: 1]
22N.1A.SL.TZ0.3
How many moles of carbon dioxide are produced by the complete combustion of 7.0 g of ethene, C2H4 (g)?
Mr = 28
A. 0.25
B. 0.5
C. 0.75
D. 1.0
[1]
Markscheme
B
Examiners report
54% of the candidates deduced the number of CO2 moles produced from 7g of C2H4. The most commonly chosen distractor was A which ignored the stoichiometric ratio.
Syllabus sections
Reactivity 2. How much, how fast and how far? » Reactivity 2.1—How much? The amount of chemical change » Reactivity 2.1.2—The mole ratio of an equation can be used to determine: • the masses and/or volumes of reactants and products • the concentrations of reactants and products for reactions occurring in solution. Calculate reacting masses and/or volumes and concentrations of reactants and products.