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The entropy change for a reversible process can be defined by the expression ?S = q?/?T. Which statement about entropy change is not correct?
a)The term q represents the heat of the system
b)This expression is valid only at equilibrium.
c)The term T represents the change in temperature.
d)?S, the change in entropy, represents Sfinal ? Sinitial.
Radio waves travel at the speed =3.00 108 m/s(speed of light,). if Saturn is 7.9 108 km from Earth then Determine how many minutes does it take for a radio message to reach Earth from Saturn?
Calculate the ratio of rates of effusion of O2 versus Cl2. Record your answers to three significant figures. The concentration of CO2 in the atmosphere is 375ppm (by volume). What is the mole fraction of CO2 in the atmosphere?
A 2.78 L sample of hydrogen chloride (HCl) gas at 2.61 atm and 28°C is completely dissolved in 651 mL of water to form hydrochloric acid solution. Calculate the molarity of the acid solution. Assume no change in volume.
The pH of rainwater in a polluted area was found to be 3.50. What is the H+ concentration
If Ka is 1.85 x 10-5 for actetic acid, calculate the pH at one-half the equivalence point and at the equivalence point for a titration of 50 mL of 0.100 M acetic acid with 0.100 M NaOH
The molar solubility of calcium phosphate. b) The molar concentration of calcium ions at equilibrium. c) The molar concentration of phosphate ions at equilibrium.
Calculate the volume of a balloon at the final temperature if this balloon at temperature of 279K and an initial volume of 2.3L is warmed to 406K.
A system absorbs 192 kj of heat and the surroundings do 120 kj of work on the system. what is the change in internal energy of the system
n-type semiconductors can be formed by addition of the elemental metals to the parent compound. For example, addition of Zr to ZrO or Ti to TiO. Like wise, p-type semiconductors
Assume that the system benzene and chlorobenze at 100 degree celcius obeys Raoult's law. for a binary mixture with an overall mole fraction Z=.30 determine
Calculate the overall (triangle)H degrees for the reaction shown given the bond dissassociation enrgies
How many grams of oxygen gas are required to produce 7.68 kJ of heat when hydrogen gas burns at constant pressure to produce gaseous water?
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