Question

How much heat is needed to raise the temperature of 100 g of water from 25 c to 50 c?

Answer 1

Q=ms∆t,. m-mass,s-specific heat capacity ,-temperature Q=100g×1calg^-1c^-1×(50-25)=2500cal. total heat energy required is 2500cal

Answer 2

Answer : The amount of heat needed is, 10465 grams

Solution :

Formula used :

$Q= m\times c\times \Delta T$

where,

Q = heat gained

m = mass of the substance = 100 g

c = heat capacity of water= 4.186 J/g°C      

$\Delta T=\text{Change in temperature}=(50-25)=25^oC$ 

Now put all the given values in the above formula, we get the amount of heat needed.

$Q=100g\times 4.186J/g^oC\times25^oC$

$Q=10465J$

Therefore, the amount of heat needed is, 10465 grams