DP Chemistry (last assessment 2024)

Question 19N.2.sl.TZ0.a(iii)

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

a(iii).

[Maximum mark: 1]

19N.2.sl.TZ0.a(iii)

Automobile air bags inflate by a rapid decomposition reaction. One typical compound used is guanidinium nitrate, C(NH₂)₃NO₃, which decomposes very rapidly to form nitrogen, water vapour and carbon.

Calculate the pressure, in kPa, of this gas in a 10.0 dm³ air bag at 127°C, assuming no gas escapes.

[1]

Markscheme

« $p = \frac{{0.409{\text{mol}} \times {\text{8}}{\text{.31 J }}{{\text{K}}^{ - 1}}{\text{mo}}{{\text{l}}^{ - 1}} \times \left( {127 + 273} \right){\text{K}}}}{{{\text{10}}{\text{.0 d}}{{\text{m}}^3}}}$ » = 136 «kPa» ✔

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Core

Core » Topic 1: Stoichiometric relationships » 1.3 Reacting masses and volumes

Core » Topic 1: Stoichiometric relationships

Question 19N.2.sl.TZ0.a(iii)

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