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Question 19M.2.SL.TZ2.di

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

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.

A helium atom has a volume of 4.9 × 10-31 m3.

Calculate the ratio   total volume of helium atoms volume of helium gas .

[1]

Markscheme

« 4 × 10 20 × 4.9 × 10 − 31 3.2 × 10 − 6 = » 6 × 10 − 5  ✔

Examiners report

This was well answered with the most common mistake being to use the volume of a single atom rather than the total volume of the atoms.

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