How much energy is required to boil a kettle of water containing 1 litre at 15°C (Specific heat capacity of water = 4.18?
Answer: 355 kJ
Explanation
To boil 1 liter of water from 15°C to 100°C, the energy required is:
Q = mcΔT
= 1 kg × 4.18 kJ/kg°C × (100°C - 15°C)
= 1 × 4.18 × 85
= 355 kJ
This question appeared in
Past Papers (4 times)
Lecturer Chemistry Past Papers and Syllabus (1 times)
SPSC 25 Years Past Papers Subject Wise (Solved) (2 times)
SPSC Past Papers (1 times)
This question appeared in
Subjects (1 times)
EVERYDAY SCIENCE (1 times)
Related MCQs
- A milkman adds 10 litre water in 10 litre milk. His son takes 15 litre of the milk and adds 5 litre water in it. Find out the amount of water in litres in this milk?
- What is the primary reason why water has a high specific heat capacity compared to other liquids?
- The specific heat of lead is 0.030 cal/gC° 300g of lead shot at 100°C is mixed with 100 g of water at 70°C in an insulated container. The final temperature of the mixture is?
- Water does not boil at ______?
- In order to boil water at 110°C, external pressure should be _____?
- When water vapours are cooled, energy will be released and gaseous state will convert into liquid water. This process is known as?
- The latent heat of vaporization of water is 2,240 J. If the work done in the process of vaporization 1g is 168 J, then the increase in internal energy is?
- The heat of sublimation of potassium is 98kJ/mol, the heat of dissociation of bromine gas is 192.5 kJ/mol. The ionization energy of K is 414 kJ/mol. The electron affinity of Br is -334.7 kJ/mol and the heat of formation of KBr is -405.8 kJ/mol. Calculate the lattice energy of KBr
- The relation between time and water pulled by a water pump is direct. If a pump raises 600 liters water in 45 minutes, how much water it will raise in one hour?
- To fill a tank, 25 buckets of water is required to fill the same tank if the capicity of the buckets is reduced to two fifth of its present capacity?
