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Question 19M.2.SL.TZ2.a

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.2.SL.TZ2.a
Level SL Paper 2 Time zone TZ2
Command term Show that Question number a Adapted from N/A
a.
[Maximum mark: 1]
19M.2.SL.TZ2.a

A container of volume 3.2 × 10-6 m3 is filled with helium gas at a pressure of 5.1 × 105 Pa and temperature 320 K. Assume that this sample of helium gas behaves as an ideal gas.

The molar mass of helium is 4.0 g mol-1. Show that the mass of a helium atom is 6.6 × 10-27 kg.

[1]

Markscheme

m = 4.0 × 10 − 3 6.02 × 10 23 «kg»

OR

6.64 × 10−27 «kg» ✔

 

Examiners report

The mark was awarded for a clear substitution or an answer to at least 3sf. Many gained the mark for a clear substitution with a conversion from g to kg somewhere in their response. Fewer gave the answer to the correct number of sf.

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