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3 marksSpecific Latent Heat, l

CSEC Physics · May/June 2019 · Paper 2 · Question 3(c)(ii)

A student conducted an experiment where 1.5 kg of water at 30 °C was converted to steam at 100 °C. Assume no heat is lost to the surroundings. Specific heat capacity of water, c = 4200 J kg⁻¹ K⁻¹. Specific latent heat of vaporization of water, lv = 2.3 × 10⁶ J K⁻¹.

Calculate the amount of energy needed to convert the water at 100 °C to steam at 100 °C.

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Other parts of this question

  1. 3(a)(i)Define the term 'heat capacity'.[2 marks]
  2. 3(a)(ii)Define the term 'specific latent heat of vaporization'.[3 marks]
  3. 3(b)Sketch a graph on Figure 4 to represent the statement above.[2 marks]
  4. 3(c)(i)Calculate the amount of energy needed to heat the water from 30 °C to 100 °C.[4 marks]
  5. 3(c)(iii)Calculate the amount of energy needed to heat the water from 30 °C to steam at 100 °C.[1 mark]

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