DP Chemistry (last assessment 2024)

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Question 22N.2.sl.TZ0.e.iv

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Date November 2022 Marks available [Maximum mark: 1] Reference code 22N.2.sl.TZ0.e.iv
Level sl Paper 2 Time zone TZ0
Command term Calculate Question number e.iv Adapted from N/A
e.iv.
[Maximum mark: 1]
22N.2.sl.TZ0.e.iv

Ammonium nitrate, NH4NO3, is used as a high nitrogen fertilizer.

Cold packs contain ammonium nitrate and water separated by a membrane.

The cold pack contains 9.50 g of ammonium nitrate. Calculate the percentage error in the experimentally determined mass of ammonium nitrate obtained in (e)(ii).

If you did not obtain an answer in (e)(ii), use 6.55 g, although this is not the correct answer.

[1]

Markscheme

«% error = 9.50 g-8.01 g9.50 g×100 %=» 15.7«%» ✔

 

Accept range 14.7 – 15.8«%».

If 6.55 g used then answer is 31.1«%».

Examiners report

Half of the candidates calculated the percentage error correctly. Some candidates left this question blank, some divided by the actual yield and some calculated the percentage yield instead.

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