DP Chemistry (first assessment 2025)

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Question 19N.2.SL.TZ0.6a(ii)

Date	November 2019	Marks available	[Maximum mark: 1]	Reference code	19N.2.SL.TZ0.6a(ii)
Level	SL	Paper	2	Time zone	TZ0
Command term	Calculate	Question number	a(ii)	Adapted from	N/A

a(ii).

[Maximum mark: 1]

19N.2.SL.TZ0.6a(ii)

(a(ii))

Calculate the total number of moles of gas produced from the decomposition of 10.0 g of guanidinium nitrate.

[1]

Markscheme

moles of gas = « $\frac{{10.0{\text{g}}}}{{122.11{\text{g mo}}{{\text{l}}^{ - 1}}}}$ » 0.409 «mol» ✔

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.