Question

How much amount of heat does water require to absorb for temperature of one gram to increase 1 degree Celsius?

• A. 4.184 Joules
• B. 4.194 Joules
• C. 4.174 Joules
• D. 4.164 Joules

Answer 1

Answer: (A)

4.184 Joules

The amount of heat required to raise the temperature of 1 gram of water through $1^{o}C$ , is called 1 calorie .

and $1calorie=4.184joule$ ,

OR

The amount of heat $Q$ supplied to mass $m$ of a substance to raise its temperature through $\Delta t$ is given by ,

$Q=mc\Delta t$ ,

where $c=$ specific heat of substance ,

given $m=1g,\Delta t=1^{o}C$ and we have $c=1cal.g{/}^{o}C$ (for water) ,

hence $Q=1\times 1\times 1=1calorie$ ,

now $1calorie=4.184joule$