Consider the two pucks shown in the figure. As they move towards each other, the momentum of each puck is equal in magnitude and opposite in direction. Giventhat Vi, green= 10.0 m/s, and m blue is 35.0% greater than mgreen, what are the final speeds of each puck (in m/s), if ✗½ the kinetic energy of the system isconverted to internal energy?130.0°30.0Vgreenm/sVbluem/s

Answered: Image /qna-images/answer/d5583f9b-38aa-4203-9e80-93959257b293.jpg

Answered: Consider the two pucks shown in the…

World of Chemistry, 3rd edition

3rd Edition

ISBN:9781133109655

Author:Steven S. Zumdahl, Susan L. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan L. Zumdahl, Donald J. DeCoste

Chapter10: Energy

Section: Chapter Questions

Problem 2STP

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In the 1880s, Frederick Trouton noted that the enthalpy of vaporization of 1 mol pure liquid is approximately 88 times the boiling point, Tb, of the liquid on the Kelvin scale. This relationship is called Troutons rule and is represented by the thermochemical equation liquid gas H = 88 Tb, joules Combined with an empirical formula from chemical analysis, Troutons rule can be used to find the molecular formula of a compound, as illustrated here. A compound that contains only carbon and hydrogen is 85.6% C and 14.4% H. Its enthalpy of vaporization is 389 J/g, and it boils at a temperature of 322 K. (a) What is the empirical formula of this compound? (b) Use Troutons rule to calculate the approximate enthalpy or vaporization or one mole of the compound. Combine the enthalpy of vaporization per mole with that same quantity per gram to obtain an approximate molar mass of the compound. (c) Use the results of parts (a) and (b) to find the molecular formula of this compound. Remember that the molecular mass must be exactly a whole-number multiple of the empirical formula mass, so considerable rounding may be needed.
You heat 1.000 quart of water from 25.0C to its normal boiling point by burning a quantity of methane gas, CH4. What volume of methane at 23.0C and 745 mmHg would you require to heat this quantity of water, assuming that the methane is completely burned? The products are liquid water and gaseous carbon dioxide.
On complete combustion at constant pressure, a 1.00-L sample of a gaseous mixture at 0C and 1.00 atm (STP) evolves 75.65 kJ of heat. If the gas is a mixture of ethane (C2H6) and propane (C3H8), what is the mole fraction of ethane in the mixture?
Nitrogen gas is confined in a cylinder with a movable piston under a constant pressure of 9.95 104 Pa. When 695 J of energy in the form of heat is transferred from the gas to the surroundings, its volume decreases by 1.88 L. What is the change in internal energy of the gas?
In the equation w = P V, why is there a negative sign?
Some solar-heated homes use large beds of rocks to store heat. (a) How much heat is absorbed by 100.0 kg of rocks if their temperature increases by 12C? (Assume that c=0.82J/gC.) (b) Assume that the rock pile has total surface area 2 m2. At maximum intensity near the earth's surface, solar power is about 170 watts/m2. (1watt=1J/s.) How many minutes will it take for solar power to produce the 12C increase in part (a)?
A rubberized, cubic chamber was filled with butane gas and was expanded from 3.0L to 4.5L at a pressure of 2.7atm and it absorbed 230J of heat from the surroundings. b. Assuming that the internal energy of this system is all kinetic energy and that the cube contains one mole of butane gas, what is the velocity of a single butane molecule covering a distance between the opposite corners of the expanded cube (express in m)? How long would it take to cover that distance (express in sec, use SI prefixes instead of scientific notation)?c. How much power can be generated by all the molecules in this cube after 1 hour? Express your answer in W. (Use the v obtained from 2b then recompute total KE) (Note that 1L atm=101.325J)
A 43.97 kg cheetah is running after a gazelle at 24.89 m/s What is the kinetic energy of this cheetah in joules while chasing the gazelle at this rate of speed?
Suppose an Olympic diver who weighs 52.0 kg executes astraight dive from a 10-m platform. At the apex of the dive,the diver is 10.8 m above the surface of the water. (a) Whatis the potential energy of the diver at the apex of the dive,relative to the surface of the water? (b) Assuming that all thepotential energy of the diver is converted into kinetic energyat the surface of the water, at what speed, in m/s, will thediver enter the water? (c) Does the diver do work on enteringthe water? Explain.
Which is greater -- the average speed or the most-probable speed? Explain why this is the case.
The emission of NO2 by fossil fuel combustion can be prevented by injecting gaseous urea into the combustion mixture. The urea reduces NO (which oxidizes in air to form NO2) according to the reaction:2 CO(NH2)2( g) + 4 NO( g) + O2( g)------------->4 N2( g) + 2 CO2( g) + 4 H2O( g)Suppose that the exhaust stream of an automobile has a flow rate of 2.55 L/s at 655 K and contains a partial pressure of NO of 12.4 torr. What total mass of urea is necessary to react completely with the NO formed during 8.0 hours of driving?
An important flavor component of vanilla extract is vanillin (C8H8O3, molar mass = 152.15 g/mol). When vanillin burns in a bomb calorimeter with a heat capacity of 7.87 kJ/°C, the temperature increases from 25.52°C to 30.43°C. If the heat of combustion of vanillin is -3,760 kJ/mol, what mass of vanillin (in g) was combusted? Please give your answer to 2 decimal places.

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