A cook wants to heat 1.35 kg of water from 32.0 °C to 100.0 °C. If he uses the combustion of natural gas (which is exothermic) to heat the water, how much natural gas will he need to burn? Natural gas produces 49.3 kJ of heat per gram. (For the sake of simplicity, assume that the transfer of heat is 100% efficient.)

Solution 104P

The heat released by combustion of the natural will be gained by water, so from the given datas you can find how much heat is gaine by the water

q = m C T

q =(4.184 kJ/kg°C)(1.350...