Calculate the no. of moles in `6 xx 10^21 NH_3`,` 5 XX10 ^21 C ` atoms and ` 6.023 xx 10^11 N` atoms.

Calculate the no. of moles in 1.6xx10^-2 kg of SO_2 , 5g of CaCO_2 and 10 g of NaOH

Calculate the energy of a photon of frequency 6.2 xx.10^14 Hz .

Calculate pH of 1.5 xx 10^(-3) NaOH solution.

Calculate the number of moles in the following: Mole of 3.2 times 10^(24) atoms of calcium

Show that (1 kWh = 3.6 xx 10^6J ).

Solve the following examples / numerical problems: The mass of the earth is 6xx10^24 kg. The distance between the earth and the sun is 1.5xx10^11m. If the gravitational force between the two is 3.5xx 10^22 N, what is the mass of the Sun ? ( use G =6.7xx 10^-11 Nm^-2kg^-2)

Calculate the wavelength (in nm) associated with a proton moving at 1.0 xx 10^3 m s^-1 .(Mass of proton = 1.67 xx 10^-27 kg and h = 6.63 xx 10^-34J s ).

The electron in a hydrogen atom circles around the positive nucleus with a speed of 2.18 xx 10^6 m//s in an orbit of radius 5.3 x 10^-11 m . Calculate the:- equivalent current

The electron in a hydrogen atom circles around the positive nucleus with a speed of 2.18 xx 10^6 m//s in an orbit of radius 5.3 x 10^-11 m . Calculate the:- Magnetic field produced at the proton. Given e = 1.6 xx 10^-19 c , mu_0 = 471 xx 10^-7 Wb//Am

A metal cube of side 1m is subjected to a force. The force acts normally on the whole surface of cube and its volume changes by 1.5 xx 10^(-5) m^3 . The bulk modulus of metal is 6.6 xx 10^10 N//m^2 . Calculate the change in pressure.