How do different fuel types influence the energy of a system

Frictional forces acting on an object are often converted into energy, which causes the temperature of the object to rise slightly.

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

When 13.3 g koh is dissolved in 102.7 g of water in a coffee-cup calorimeter, the temperature rises from 21.4 °c to 31.53 °c. what is the enthalpy change per gram of koh (j/g) dissolved in the water? * take the density of water as 1.00 g/ml. * assume that the solution has a specific heat capacity of 4.18 j/g*k. enter to 1 decimal place. do not forget the appropriate sign /(+). canvas may auto-delete the (+) sign