A quantity of steam at 100oC condenses to water at the same temperature by releasing…

Physics WAEC 2006

A quantity of steam at 100oC condenses to water at the same temperature by releasing 6.9 x 104J of energy. Calculate the mass of the condensed steam. [specific latent heat of vaporization of eater = 2.3 x 106 J kg-1]

  • 3.0 x 10-1 kg
  • 3.0 x 10-2 kg checkmark
  • 3.0 x 10-3 kg
  • 3.0 x 10-4 kg

The correct answer is: B

Explanation

M = \(\frac{Q}{T} = \frac{6.9 \times 10^{4}}{2.3 \times 10^6} = 3 \times 10^{-2} kg\)
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