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A 2.5 g sample of french fries is placed in a calorimeter with 500.0 g of water at an initial temperature of 21°C. After combustion of the french fries the water has a temperature of 48°C. What is the caloric value (kcal/g) of the french fries? The heat capacity, CH2O, of the water is 1.00 cal/g °C. Remember that the heat, q, absorbed be a given mass, m, of water to raise its temperature ❝T degrees is given by q = mCH2O❝T.

5.4 kcal/g

Explanation: heat content of French fries is released to heat the water through a temperature change of 48-21 = 27°c

Heat content h = 500*1*27 = 13500 cal

Calorific value of French fry = 13500/2.5 = 5400 cal/g

= 5.4k cal/g

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.