only 49 gative (–), orroundings; d of water = 1.00 g/mL.)Keat is released to the sur-6.45 A 455-g piece of copper tubing is heated to 89.5°C andplaced in an insulated vessel containing 159 g of water at 22.8°C.Assuming no loss of water and a heat capacity of 10.0 J/K for thevessel, what is the final temperature (c of copper = 0.387 J/g•K)?6.46 A 30.5-g sample of an alloy at 93.0°C is placed into 50.0 g ofwater at 22.0°C in an insulated coffee-cup calorimeter with a heatcapacity of 9.2 J/K. If the final temperature of the system is31.1°C, what is the specific heat capacity of the alloy?taking place6.47 When 25.0 mL of 0.500 M H,SO4 is added to 25.0 mL of 1.00 MKOH in a coffee-cup calorimeter at 23.50°C, the temperature rises to30.17°C. Calculate AH in kJ per mole of H2O formed. (Assume thatthe total volume is the sum of the volumes and that the density andspecific heat capacity of the solution are the same as for water.)6.48 When 20.0 mL of 0.200 M AGNO3 and 30.0 mL of 0.100 MNaCl, both at 24.72°C, are mixed in a coffee-cup calorimeter, AgClprecipitates and the temperature of the mixture increases to 25.65°C.Calculate AH in kJ per mole of AgCl(s) produced. (Assume that thetotal volume is the sum of the volumes and that the density andspecific heat capacity of the solution are the same as for water.)ou deter-ar heat6.49) When a 2.150-g sample of glucose, C,H12O6, is burned in abomb calorimeter with a heat capacity of 6.317 kJ/K, the tempera-eaрас-ture of the calorimeter increases from 23.446°C to 28.745°C. Cal-culate AE for the combustion of glucose in kJ/mol.6.50 A chemist places 1.750 g of ethanol, C,H,O, in a bomb calo-rimeter with a heat capacity of 12.05 kJ/K. The sample is burnedand the temperature of the calorimeter increases by 4.287°C. Cal-culate AE for the combustion of ethanol in kJ/mol.ve ort ca-n beProblems in Context6.51 High-purity benzoic acid (CH;COOH; AH for combustion :-3227 kJ/mol) is used to calibrate bomb calorimeters. A 1.221-gsample burns in a calorimeter that has a heat capacity of 6.384 kJ/°C.What is the temperature change?C.nea-6.52 Two aircraft rivets, one iron and the other copper, are placecPCin a calorimeter that has an initial temperature of 20.°C. The dat:for the rivets are as follows:

In this question, we want to determine the ∆E for the combustion of of Glucose. You can see details…

at 6.49) When a 2.150-g sample of glucose, C,H12O6, is burned in a bomb calorimeter with a heat capacity of 6.317 kJ/K, the tempera- ture of the calorimeter increases from 23.446°C to 28.745°C. Cal- culate AE for the combustion of glucose in kJ/mol.

at 6.49) When a 2.150-g sample of glucose, C,H12O6, is burned in a bomb calorimeter with a heat capacity of 6.317 kJ/K, the tempera- ture of the calorimeter increases from 23.446°C to 28.745°C. Cal- culate AE for the combustion of glucose in kJ/mol.

Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter9: Energy And Chemistry

Section: Chapter Questions

Problem 9.86PAE: 9.86 You make some iced tea by dropping 134 g of ice into 500.0 mL of warm tea in an insulated...

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9.86 You make some iced tea by dropping 134 g of ice into 500.0 mL of warm tea in an insulated pitcher. If the tea is initially at 20.0°C and the ice cubes are initially at 0.0°C, how many grams of ice will still be present when the contents of the pitcher reach a final temperature? The tea is mostly water, so assume that it has the same density (1.0 g/mL), molar mass, heat capacity (75.3 J K-1 mol-1), and heat of fusion (6.0 kJ/mol) as pure water. The heat capacity of ice is 37.7 J K-l mol-l.
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