Question

E AFTER COMPLETING LAB. ANSWER IN SPACE PROVIDED. Suppose the heat of neutralization had been determined using a glass beaker instead of a polystyrene coffee cup How would the measured value have been affected? The heat of combustion of octane, C,H,. can be measured in a way similar to the method youC used to measure the heat of neutralization. The bomb calorimeter is used instead of a coffee cup. The reaction is 2C,H,1)+ 25 O, (g) 16 CO, (g) + 18 H,O (1) When 1.02 g of octane was burned in a bomb calorimeter, the temperature of 1.00 kg of water was raised from 22.0 °C to 35.3 °C. The specific heat of water is (4.184 Jg C'). How many moles of octane were burned? What is the heat of combustion (AH) of octane in kilojoules per mole? In the calorimetry lab how would your results have been affected if you had not used a lid to cover the polystyrene cup after the acid and base solutions had been mixed? What would have been the effect on the measurement of temperature and why? b) heat capacity a) specific heat Define the following terms; A coffee cup calorimeter contains 25.0 g water at 23.8 °C. A 5.00 g sample of an unknown metal at an initial temperature of 78.3 'C was dropped into the calorimeter. The final temperature of mixture was 46.3 °C. Calculate the specific heat of the metal. The specific heat of water is (4.184Jg. C'). In a coffee cup, 75.0 g water initially at 23.0 °C was mixed with 25.0 g of water initially at 95.0 "C. What will the final temperature be after mixing? CHEM 1111 Experiment 9 Heat of Acid-Base Neutralization

Answer 1

than ealtn ene , So mare of the heat eJest Heree change in IAT) Mii 11 he ema从resulting in change, in dempeudR、m(ar) (353-22-0 13.3c 102 = |s.gr XI0"govel 3

Atl cam 100 4184 133 c 621.56 k/mel