DP Chemistry (first assessment 2025)
Question 22N.2.SL.TZ0.a
| Date | November 2022 | Marks available | [Maximum mark: 2] | Reference code | 22N.2.SL.TZ0.a |
| Level | SL | Paper | 2 | Time zone | TZ0 |
| Command term | Calculate | Question number | a | Adapted from | N/A |
a.
[Maximum mark: 2]
22N.2.SL.TZ0.a
Calculate the amount, in mol, of sulfur dioxide produced when 500.0 g of lignite undergoes combustion.
S (s) + O2 (g) → SO2 (g)
[2]
Markscheme
«» 2.0 «g» ✔
«» = 0.062 «mol of SO2» ✔
Award [2] for correct final answer.
Accept 0.063 «mol».
Examiners report
A question that discriminated well between high-achieving and low-achieving candidates. The majority of the candidates were able to achieve one mark for determining the number of moles using 500g, while stronger candidates determined 0.40% of 500g to determine the correct number of moles. A number of candidates had a power of ten error in the first step.
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.