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A block of copper of mass 500g and initial temperature at 293 k is in thermal contact with an electric heater of resistance 1.00kohm and negligible mass. A current of 1 A is passed for 15 s. Calculated the change in entropy of the copper taking C=24.4j/kmol. The experiment is then repeated with the copper immersed in a stream of water that maintains its temp at 293. Calculate the change in entropy of the copper and the water in this case.
Calculate the molarity of a phosphoric acid(H3PO4) solution that is 84% by mass phosphoric acid and has a density of 1.87g/mL.
Distillation on a mixture of benzene and toluene is performed. As the in the initial distillate is being collected, you observe the boiling point of the mixture to be 89.5 C.
For the reaction CO(g)+2H_2_(g)-->CH_3_OH(g), ?G°700K = -13.455 kJ. What is Kp for this reaction at 700. K. Any help would be greatly appreciated
What minimum mass of succimer (C4H6O4S2) (in mg) is needed to bind all of the lead in a patient's bloodstream? Assume that patient blood lead levels are 25 micrograms/deciliter.
An Ionic Compound has the formula M4(NO3)2(PO4)2. What is the net charge on the metal ion M in this Compound.
identifying and balancing the different types of chemical reactions.1. determine which processes represent chemical
Two 20.0-g ice cubes at -16.0 °C are placed into 275 g of water at 25.0 °C. Assuming no energy is transferred to or from the surroundings, calculate the final temperature of the water after all the ice melts.
an aqueous solution is 22.0 by mass silver nitrate agno3 and has a density of 1.22 gml. what is the molarity of silver
a photon has a wave lenght of 501 nm . calculate the energy of the photon in joules . enter your answer in scientific notation
Air is 21 mole percent oxygen, that is, 0.21 atm oxygen at 1 atm. Suppose the pH of the water is 5.85 and that the concentration of iron(II) in the water is 8.97x 10-5 M, what is the potential of the corrosion reaction under the above conditions a..
In which of the processes described below should the entropy increase. Choose ALL of the correct possibilities. A) ice cubes melting at -5 oC and 1 atm pressure
An unknown monoprotic weak acid, HA, has a molar mass of 55.0. A solution contains 2.50 g of HA dissolved 800. mL of solution. The solution has a pH of 2.000. What is the value of Ka for HA
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