How much thermal energy is needed to change 80 g of water initially at 60°C to steam? [c = 4200 Jkg

JAMB Physics 2023 123 views
Source: JAMB · 2023

How much thermal energy is needed to change 80 g of water initially at 60°C to steam?

[c = 4200 Jkg⁻¹K⁻¹, l = 2.26 x 10⁶ Jkg⁻¹]

  1. 194 kJ ✓
  2. 246 kJ
  3. 126 kJ
  4. 224 kJ
Explanation

This physics concept involves analyzing the given values and applying relevant formulas. Work through the problem step by step using known equations and constants.

Identify what quantity needs to be found and which formula connects the given information to the answer. Substitute the values carefully, paying attention to units.

Check that your calculated answer matches one of the options provided. Understanding the underlying principle helps verify the solution makes physical sense.

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