The quantity of heat Q released or absorbed from a substance of specific heat capacity c (which can be expressed in units cal/g • °C or J/kg • °C) and mass m (in g or kg), undergoing a change in temperature ΔT is Q = cmΔT. In lab you submerge 100 g of 40°C nails in 200 g of 20°C water. (The specific heat capacity of iron is 0.12 cal/g • °C.) Equate the heat gained by the water to the heat lost by the nails and show that the final temperature of the water is about 21°C.
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