Using the data in the table, calculate the heat energy produced in each reaction.

Question

Sample Mass Temperature Change( calorimeter) q_reaction

1 1.015g 8.01 ∘C

2 0.990 g 7.82 ∘C

3 0.963 g 7.88 ∘C

4 1.050 g 8.22 ∘C

5 1.102 g 8.42 ∘C

1. Sample 1: 𝑞reaction= ? kJ
2. Sample 2: 𝑞reaction= ? kJ
3. Sample 3: 𝑞reaction= ? kJ
4. Sample 4: 𝑞reaction= ? kJ
5. Sample 5: 𝑞reaction= ?kJ

Report the fuel value for this sweetener in kJ/g, in kcal/g, and in kJ/mol. Report your answers to the correct number of significant figures.

1. fuel value: ?kJ/g
2. fuel value: ? kcal/g
3. fuel value: ? kJ/mol

Answer 1

We know that q=mc(deltaT), where m is the mass of the sample, c is the specific heat, and deltaT is the change in temperature. So to find the heat energy produced, for each sample you would multiply its mass*temperature change given in table*specific heat of the reaction medium.

For the second part of the problem, you would take the heat energy (q) you found in the first parts and divide by 1) the total number of grams 2) convert joules to kcal and then divide by grams 3) convert the total grams to moles using molar mass and then divide by kJ/mol.