Chem Ch.5 &6.pdf - Chapter 5: Thermochemistry Exercises 5 ....

• ElderRabbit2455
• 23

Course Hero uses AI to attempt to automatically extract content from documents to surface to you and others so you can study better, e.g., in search results, to enrich docs, and more. This preview shows page 1 - 3 out of 23 pages.

Chapter 5: ThermochemistryExercises5.Calculate the heat capacity, in joules and in calories per degree, of the following:(a) 45.8 g of nitrogen gas
(b) 1.00 pound of aluminum metal
7.How much heat, in joules and in calories, is required to heat a 28.4-g (1-oz) ice cubefrom −23.0 °C to −1.0 °C?
9. If 14.5 kJ of heat were added to 485 g of liquid water, how much would itstemperature increase?
11. A piece of unknown solid substance weighs 437.2 g, and requires 8460 J toincrease its temperature from 19.3 °C to 68.9 °C.(a) What is the specific heat of the substance?
(b) If it is one of the substances found inTable 5.1, what is its likely identity?19. How much will the temperature of a cup (180 g) of coffee at 95 °C be reduced whena 45 g silver spoon (specific heat 0.24 J/g °C) at 25 °C is placed in the coffee and thetwo are allowed to reach the same temperature? Assume that the coffee has the samedensity and specific heat as water.
21. The temperature of the cooling water as it leaves the hot engine of an automobile is240 °F. After it passes through the radiator it has a temperature of 175 °F. Calculate theamount of heat transferred from the engine to the surroundings by one gallon of waterwith a specific heat of 4.184 J/g °C.
27. The addition of 3.15 g of Ba(OH)2·8H2O to a solution of 1.52 g of NH4SCN in 100 gof water in a calorimeter caused the temperature to fall by 3.1 °C. Assuming the specificheat of the solution and products is 4.20 J/g °C, calculate the approximate amount ofheat absorbed by the reaction, which can be represented by the following equation:Ba(OH)2·8H2O(s) + 2NH4SCN(aq)Ba(SCN)2(aq) + 2NH3(aq) + 10H2O(l)q=mcΔTq=(3.15g + 1.52g + 100g) x 4.20 x 3.1

Course Hero member to access this document

Course Hero member to access this document

End of preview. Want to read all 23 pages?

Course Hero member to access this document

Term
Spring
Professor
N/A
Tags
Atomic orbital