Calorie is defined as the amount of heat required to raise temperature of 1 g of water by `1^@C` and it is defined under which of the following conditions?

Options

A. From `14.5^(@)C` to `15.5^(@)C` at `760 ` mm of Hg
B. From `98.5^(@)C` to `99.5^(@)C` at 760 mm of Hg
C. From `13.5^(@)C` to `14.5^(@)C` at 76mm og Hg
D. From `3.5^(@)C` to ` 4.5^(@)C` at 76 mm of Hg

Answer

A

Explanation

One calorie is the heat required to raise the temperature of 1 g of water from 14.5°C to 15.5°C at 760 mm of Hg. (i.e. at 1 atm)