Place a burning Cheeto underneath a beaker of water. The burning Cheeto heats the water. The initial and final temperature of the water is measured and recorded. Temperature rise is monitored. The change in temperature is calculated. The heat gained by the water is calculated,
q gained by water = mass of the water x specific heat of the water x ΔT.
The heat given off by the Cheeto is calculated q loss + g gain = 0 q loss by Cheeto + q gain water = 0