Calculate the area of a rectangular field of length `(30.55_-^+0.65)``(20.45_-^+0.55)` m.

Calculate the PH of 0.004 M KOH.

Calculate the PH of 0.001 M HCl.

Calculate the momentum of wave-length 0.33 nm.

Calculate the PH Of 0.005 M H_2SO_4 .

The length and breadth of a rectangle are (5.7 +-0.1)cm and b=(3.4+-0.2)cm . Calculate area of the rectangle with error limits.

One gram of charcoal adsorbs 100 mL of 0.5 M -acetic acid to form a monolayer and the molarity of acetic acid reduces to 0.49. Calculate the surface area of charcoal adsorbed by each molecule of acetic acid. The surface area of charcoal is 3.01xx 10^2 m^2 g^(-1) .