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How much heat energy is gained when 5 kg of water at 20°C is brought to its boiling point (Specific heat of water = 4.2 kJ/kg oC)
  • a)
    1680 kJ
  • b)
    1700 kJ
  • c)
    1720 kJ
  • d)
    1740 kJ
Correct answer is option 'A'. Can you explain this answer?
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How much heat energy is gained when 5 kg of water at 20°C is broug...
Q  = mcΔT = 5 × 4.2 × (100−20) = 1680kJ
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How much heat energy is gained when 5 kg of water at 20°C is broug...
To determine the amount of heat energy gained by 5 kg of water at 20 degrees Celsius, we need to use the specific heat capacity of water.

The specific heat capacity of water is approximately 4.18 J/g°C.

First, let's convert the mass of water to grams:
5 kg = 5000 grams

Next, we'll calculate the change in temperature:
Change in temperature = final temperature - initial temperature
= 100°C - 20°C
= 80°C

Now we can calculate the heat energy gained using the formula:
Heat energy gained = mass × specific heat capacity × change in temperature

Heat energy gained = 5000 grams × 4.18 J/g°C × 80°C
= 1672000 J

Therefore, the amount of heat energy gained by 5 kg of water at 20 degrees Celsius is 1,672,000 Joules.
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How much heat energy is gained when 5 kg of water at 20°C is brought to its boiling point (Specific heat of water = 4.2 kJ/kgoC)a)1680 kJb)1700 kJc)1720 kJd)1740 kJCorrect answer is option 'A'. Can you explain this answer?
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How much heat energy is gained when 5 kg of water at 20°C is brought to its boiling point (Specific heat of water = 4.2 kJ/kgoC)a)1680 kJb)1700 kJc)1720 kJd)1740 kJCorrect answer is option 'A'. Can you explain this answer? for Defence 2024 is part of Defence preparation. The Question and answers have been prepared according to the Defence exam syllabus. Information about How much heat energy is gained when 5 kg of water at 20°C is brought to its boiling point (Specific heat of water = 4.2 kJ/kgoC)a)1680 kJb)1700 kJc)1720 kJd)1740 kJCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Defence 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for How much heat energy is gained when 5 kg of water at 20°C is brought to its boiling point (Specific heat of water = 4.2 kJ/kgoC)a)1680 kJb)1700 kJc)1720 kJd)1740 kJCorrect answer is option 'A'. Can you explain this answer?.
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