Neco 2018 Chemistry Question 6

Practice essay / theory question 6 from the 2018 Neco Chemistry examination. This question covers States of Matter .

Neco 2018 Chemistry Essay / Theory

Topic: States of Matter

Question 6 NECO • 2018 • CHEMISTRY • essay

A 2.00 g sample of a pure substance is heated from –20 °C to 120 °C. The substance has a melting point of 0 °C and a boiling point of 80 °C. Its molar mass is 40.0 g mol⁻¹. The specific heat capacities are: solid = 1.0 J g⁻¹ K⁻¹, liquid = 2.0 J g⁻¹ K⁻¹, gas = 0.8 J g⁻¹ K⁻¹. The enthalpy of fusion is 6.0 kJ mol⁻¹ and the enthalpy of vaporisation is 30.0 kJ mol⁻¹. Determine:

( a )

The total amount of heat (in joules) required to raise the sample from –20 °C to 120 °C, taking into account all phase changes.

( b )

If the sample is heated at a constant rate of 5.0 J s⁻¹, the time (in minutes and seconds) required for the sample to become completely vapourised.

( c )

The temperature at which the sample is completely vapourised.

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This is Neco 2018 Chemistry Question 6. It is one of the essay questions from the 2018 Neco Chemistry examination.

The question covers States of Matter .

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