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Half-lives of two radioactive substances A and B are respectively 20 minutes and 40 minutes. Initially the samples of A and B have equal number of nuclei. Find the ration of remaining number of A and B nuclei after 80 minutes.


Calculate the mass of Ba(OH)2 required to prepare 2.5L of a 0.06 molar solution of barium hydroxide.



One kg water at velocity 12.5 m/s and 30oC enters a 2.54 cm diameter horizontal pipe where



there is no heat or work exchange with the surroundings. The water suddenly flows through a



larger pipe with a diameter of 3.85cm. Calculate the following:



a. Velocity of the water leaving the pipe in m/s



b. The change in temperature of the water. Cpwater=4.18 𝐾𝐽/



𝐾𝑔.𝐾

An ideal gas undergoes a mechanically reversible process (constant pressure, constant




temperature and adiabatic process. The gas entering a T1=650K and P1=10bar decreases its




temperature at constant pressure where V2=2.91x10-3 m3




. Then, it went to isothermal process to




decrease its pressure. Finally, the gas returns to its initial state. Take Cp=7




2




𝑅 and Cv==




5




2




𝑅.




Calculate the following:




a. T2,P3, V1 and V3




b. Q,W,Ξ”U and Ξ”H

2. The equilibrium constant for the production of ammonia, used as fertilizer, is 3.65x 108 at 25 ⁰C. N2(g) + 3 H2(g) ⇋ 2 NH3(g) . Calculate the equilibrium concentration of hydrogen gas, if at equilibrium the concentrations of nitrogen and ammonia are 2.56 M and 5.76 M 3 The equilibrium constant of oxalic acid present in many fruits at 25 ⁰C. is 6.5 x 10-2. The reaction is C2H2O4(aq) ⇋ H + (aq) + C2HO4 - (aq) What is the concentration of H+ at 25⁰C if the concentration of C2H2O4 and C2HO4 - at equilibrium are 3.0111 M and 0.44415 M respectively?Β 


What is the molecular orbital theory?


Calculate the [H+] of a 0.10 M solution of acetic in 0.25 M sodium acetate.

an NaCl solution has a concentration of 132 ppm. What volume of solution will provide a mass of 0.024 g of NaCl



A 0.020M solution of the weak acid HA is 0.60% ionized. Calculate the value of the ionization constant for this acid.

I here am casual, but was specially registered at a forum to participate in discussion of this question.


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