DP Chemistry (first assessment 2025)

Question 20N.1A.SL.TZ0.4

Date	November 2020	Marks available	[Maximum mark: 1]	Reference code	20N.1A.SL.TZ0.4
Level	SL	Paper	1A	Time zone	TZ0
Command term	Solve	Question number	4	Adapted from	N/A

[Maximum mark: 1]

20N.1A.SL.TZ0.4

Which volume of ethane gas, in ${cm}^{3}$ , will produce $40 {cm}^{3}$ of carbon dioxide gas when mixed with $140 {cm}^{3}$ of oxygen gas, assuming the reaction goes to completion?

$2 C_{2} H_{6} (g) + 7 O_{2} (g) \to 4 {CO}_{2} (g) + 6 H_{2} O (g)$

A. $10$

B. $20$

C. $40$

D. $80$

[1]

Markscheme

Examiners report

More than 65% of candidates were able to apply coefficient ratios in a stoichiometry question involving only gaseous reactants and products.

Syllabus sections

Structure 1. Models of the particulate nature of matter » Structure 1.5—Ideal gases » Structure 1.5.4—The relationship between the pressure, volume, temperature and amount of an ideal gas is shown in the ideal gas equation PV = nRT and the combined gas law P1V1T1= P2V2T2. Solve problems relating to the ideal gas equation.

Question 20N.1A.SL.TZ0.4

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