Burning one liter of natural gas produces 9.46 kcal of heat energy. Express the energy in kilojoules (given that 1 kcal = 4.184 kJ). 

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Strategy Plan STEP 1: What unit is asked for in the answer? STEP 2: What given value is related to the answer? STEP 3: What unit factor(s) should we apply? The unit equation is 1 kcal = 4.184 kJ, so the two unit factors are 1 kcal/4.184 kJ, and its reciprocal 4.184 kJ/1 kcal. Unit Analysis Map given value 9.46 kcal X unit factor 1 kcal 4.184 kJ or Step 1: Step 2: Step 3: 4.184 kJ 1 kcal unit in answer ? kJ = 1 kcal 4.184 kJ kJ 9.46 kcal or 4.184 kJ 1 kcal