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Ideal Gases · Paper 2 — Free Chemistry SL Practice Questions

1MasterySAQ-SIdeal gas law (PV = nRT)7 marksPaper 2~11 min

A student investigates the behaviour of dinitrogen monoxide,

\text{N}_2\text{O}

, used as a mild anaesthetic in dentistry. A sealed syringe contains

0.920\,\text{g}

\text{N}_2\text{O}

22.0\,°\text{C}

and occupies a volume of

0.500\,\text{dm}^3

(a)

State two assumptions of the ideal gas model that are violated by real gases at high pressure or low temperature. [2 marks]

(b)

Calculate the pressure, in kPa, exerted by the

\text{N}_2\text{O}

gas, assuming ideal behaviour. [3 marks]

(c)

The actual pressure measured inside the syringe is slightly lower than the value calculated in (b). Explain why, with reference to the assumptions stated in (a). [2 marks]

Solutions

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