Combustion of hydrogen releases 142 kJ per gram of hydrogen reacted.How many kilocalories of energy are released by the combustion of 16.0 ounces of hydrogen?

Question

Quizplus · Accepted Answer

First, convert 16.0 ounces to grams, knowing that 1 ounce = 28.3495 grams. So, 16.0 ounces * 28.3495 grams/ounce = 453.592 grams. Then, multiply the mass of hydrogen by the energy released per gram: 453.592 grams * 142 kJ/gram = 64410.064 kJ. To convert kJ to kcal, use the conversion factor 1 kcal = 4.184 kJ. So, 64410.064 kJ * (1 kcal / 4.184 kJ) = 15392.2 kcal, which is approximately 1.54 × 10^4 kcal.

Combustion of Hydrogen Releases 142 KJ Per Gram of Hydrogen