Cooking pan whose inner diameter is 20 cm is filled with water and covered with a 4-kg lid. if the local atmospheric pressure is 101 kpa, determine the temperature at which the water starts boiling when it is heated.

The boiling point of a liquid highly depends on the pressure in the atmosphere. In this case, 101 kPa is the ambient or atmospheric pressure. At this pressure, water boils at exactly 100 degrees Celsius. Hence the answer is:

100 degrees Celsius

answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.