DP Chemistry (last assessment 2024)

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Question 19M.3.hl.TZ1.c

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.3.hl.TZ1.c
Level hl Paper 3 Time zone TZ1
Command term Calculate Question number c Adapted from N/A
c.
[Maximum mark: 1]
19M.3.hl.TZ1.c

Lithium has many uses.

Lithium is obtained by electrolysis of molten lithium chloride. Calculate the time, in seconds, taken to deposit 0.694 g Li using a current of 2.00 A.

Q (charge) = I (current) × t (time)

[1]

Markscheme

n «=  m M r = 0.694 6.94 » =0.100«mol» 

«  t = 0.100 mol × 96 500 C mo l − 1 2.00  C  s − 1 »

4830 «s»   [✔]

Examiners report

The calculation in was done well.

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