DP Chemistry (first assessment 2025)
Question 19M.1A.SL.TZ2.1
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.1A.SL.TZ2.1 |
| Level | SL | Paper | 1A | Time zone | TZ2 |
| Command term | Question number | 1 | Adapted from | N/A |
1.
[Maximum mark: 1]
19M.1A.SL.TZ2.1
How many moles of magnesium hydroxide are produced with 0.50 mol of ammonia?
Mg3N2 (s) + 6H2O (l) → 3Mg(OH)2 (aq) + 2NH3 (aq)
A. 0.25
B. 0.33
C. 0.75
D. 1.5
[1]
Markscheme
C
Examiners report
This was one of the easier questions on the paper. 79 % of the candidates were able to deduce the amount of a product given the amount of another product and the balanced equation.
Syllabus sections
Structure 1. Models of the particulate nature of matter » Structure 1.4—Counting particles by mass: The mole » Structure 1.4.5—The molar concentration is determined by the amount of solute and the volume of solution. Solve problems involving the molar concentration, amount of solute and volume of solution.