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 πΎπ½/
πΎπ.πΎ
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
π and Cv==
5
2
π .
Calculate the following:
a. T2,P3, V1 and V3
b. Q,W,ΞU and ΞH
2. The equilibrium constant for the production of ammonia, used as fertilizer, is 3.65x 108 at 25 β°C. N2(g) + 3 H2(g) β 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 β°C. is 6.5 x 10-2. The reaction is C2H2O4(aq) β H + (aq) + C2HO4 - (aq) What is the concentration of H+ at 25β°C 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.
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