The concentration of hydrogen ion in a sample of soft drink is `3.8xx 10^(-3)` M What its pH?

If the radius of the innermost orbit of hydrogen atom is 5.3x10^(-11) m what is the radius of the third orbit?

The radius of the inner most electron orbit of a hydrogen atom is 5.3xx10^(-11) m. Find out the radii of the n=2 and n= 3 orbits?

For a reaction 2A rarr 4B+C , the concentration of B is increased by 5.0xx10^(-3) molL^(-1) in 10 seconds. Calculate the rate of disappearance of A.

What concentration of nitrogen should be present in a glass of water at room temperature at 25^@C , a total pressure of 1 atm and mole fraction on nitrogen in air of 0.78 [ K_H for nitrogen = 8.42xx10^(-7)M//mmHg ].

Calculate the excess of pressure in a soap bubble of radius 3xx10^-3 m surface tension of the soap solution is 20xx10^-3 N/m.

The concentration of a solution having concentration 0.24M is reduced to 0.12M in 10 hours and 0.06M in 20 hours. What is the rate of the reaction?