DP Chemistry (last assessment 2024)

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Question 22N.1.sl.TZ0.1

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

How many oxygen atoms are present in 0.0500 mol Ba(OH)2•8H2O?

NA = 6.02 × 1023

 

A.   3.01 × 1023

B.   6.02 × 1023

C.   3.01 × 1024

D.   6.02 × 1024

[1]

Markscheme

A

Examiners report

57% of the candidates calculated the number of oxygen atoms correctly. The most commonly chosen distractor was C which would be achieved if a power of ten error was made.

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