calculate the specific heat of 200g of substance whose temperature is 30 degree celcius if it is mixed with 200g of water heated in a 300g iron container at 100 degree celcius. the final temperature of the mixture is 98 degree celcius.

Answer 1

In any closed system, the sum of heats gained is zero.

Heatsubstance+heatiron+heat water=0
200*c*(98-30)+300ciron*(98-100)+200cwater*(98-100)=0

look up the spec heat for iron, water, and solve for c.