Question

Two liquids l1 and l2 are at 20 degree and 40 degree when equal masses of them are mixed together

Answer 1

the liquid at 20 degree Celsius absorbs
heat while liquid at 40 degree Celsius
release heat
hence let final temperature is T
and s is specific heat capacity
ms(T-20) = ms(40-T)
the masses are same and both are liquids hence masses and specific heat capacities get cancelled from equation
and. T-20 = 40-T
2T = 60
T = 60
the final temperature of liquid is 60 degree Celsius