Calorimetry: Measuring Heat of Neutralization Name Date Section 1. There are 15

Question

Calorimetry: Measuring Heat of Neutralization Name Date Section 1. There are 15 Calories (15 kcal) in one 4.0 g serving of table sugar, which is sucrose, C12H22011. Find the number of a) cal/lg b) kJ/g c) kJ/mol 2. A 27.8 g mass of copper metal at 100°C is added to 100 g of water at 20.0°c (specific heat 4.18 J/g°C) and the final temperature is 22.0°C. What is the specific heat of copper? Does your answer seem reasonable? Explain. 3. A 0.250 g sample of solid potassium is dropped into a beaker containing 100 mL of water a) Give a balanced chemical equation for the reaction that takes place; one product is aqueous potassium hydroxide b) Calculate the heat of the reaction using "f (in kJ/mol):H20(1) -286 KOH(aq)-482 c) Is the reaction exothermic or endothermic?

Explanation / Answer

Ans 1 :

a) cal/g

15 kcal in 4.0 g of sugar

1 kcal = 1000 cal

so 15 kcal = 15 x 1000 cal = 15000 cal

then 15000 / 4.0 cal/g

= 3750 cal/g

b) KJ / g

1 kcal = 4.184 KJ

So 15 kcal = 15 x 4.184 = 62.76 KJ

Then 62.76 KJ / 4 g

= 15.69 KJ / g

c) KJ / mol

molar mass of sugar = 342.3 g/mol

4g = 4 / 342.3 = 0.0117 mol

Then 62.76 KJ / 0.0117 mol

= 5364.1 KJ / mol

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