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Problem- Suppose that you were able to design an engine without a cold sink, so that the energy from a hot object could be transferred to the surroundings entirely as work, with no heat exchanged. (a) What would be the entropy change of the surroundings? (b) Could such an engine operate spontaneously? Explain.
Please give an idea about how you obtained the answer
A X^2+ ion derived from a metal in the first transition metal series has four electros in the 3d subshell. What element might X be?
At room temperature, soln of Ca(OH)2 (74.09 g/mol) contains 0.16 g of Ca(OH)2 per 100 mL of solution. What is the pH of this solution
Problem- A 25.0-mL solution of 0.0700 M EDTA was added to a 31.0-mL sample containing an unknown concentration of V3. All V3 present formed a complex, leaving excess EDTA in solution. This solution was back-titrated with a 0.0450 M Ga3 solution un..
Explain how you arrived at this conclusions. Write a balance chemical equation for the reaction that occurs when sodium cyanide dissolves in water.
How many liters of softened water, containing a sodium concentration of 5.8×10^-2% sodium by mass, have to be consumed to exceed the FDA recommendation (less than 2.4 g sodium per day)? (Assume a water density of 1.0 g/mL.)
If a noxious green gas in a chamber is heated to 1.50 times its former temperature as well as the volume it occupies is doubled. Explain by what percentage does its pressure change and in what direction
Barium, Ba, is used in X-Ray applications. The barium nucleus has a charge of +56. A barium atom has lost two outer electrons and has become a positively charged ion. How many electrons does this ion have
Calculate the pH after the following amounts of NaOH are added. A) 0mL NaOH added( before the titration started)
a 25 gram sample of a metal at 75.00 c is placed in a calorimeter containing 25 grams of water at 20.00 c. the
A 1.0-L buffer solution is 0.105M in HNO 2 and 0.145M in NaNO 2. Determine the concentrations of HNO 2 and NaNO 2 after addition of 1.4g NaOH.
Calculate the pH of the solution after the addition of 100mL of 1.00 M HCL. the Ka for Hf is 3.5*10-4
calculate the mass of MgCO3 precipitated by mixing 10.0 mL of a 0.200 M Na2CO3 solution with 5.0 mL of a 0.0450 M Mg(NO3)2
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