If 100 g of water at 0°C is mixed with 100 g of water at 100°C, what will be the

Practice Questions

Q1
If 100 g of water at 0°C is mixed with 100 g of water at 100°C, what will be the final temperature of the mixture?
  1. 50°C
  2. 25°C
  3. 75°C
  4. 0°C

Questions & Step-by-Step Solutions

If 100 g of water at 0°C is mixed with 100 g of water at 100°C, what will be the final temperature of the mixture?
Correct Answer: 50°C
  • Step 1: Understand that we have two amounts of water: 100 g at 0°C and 100 g at 100°C.
  • Step 2: Recognize that when you mix these two amounts of water, they will exchange heat until they reach the same temperature.
  • Step 3: Use the principle of conservation of energy, which states that the heat lost by the hot water will equal the heat gained by the cold water.
  • Step 4: Since both amounts of water are the same (100 g), and they are mixed together, the final temperature will be the average of the two temperatures.
  • Step 5: Calculate the average temperature: (0°C + 100°C) / 2 = 50°C.
  • Step 6: Conclude that the final temperature of the mixture is 50°C.
  • Conservation of Energy – The principle that energy cannot be created or destroyed, only transferred or converted from one form to another.
  • Heat Transfer – The process of thermal energy moving from a hotter object to a cooler one until thermal equilibrium is reached.
  • Specific Heat Capacity – The amount of heat required to change the temperature of a unit mass of a substance by one degree Celsius.
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