Find the total mass of neutrons in 7 mg of `^(14)C`

Find the total mass of protons in 34 mg of NH_(3) at STP.

Find the number of neutrons in deuterium .

Find the wavelength for a beam of neutrons,whose kinetic energy is 100 eV.Given that mass of neutron = 1.676 xx 10^(-24) g and h= 6.62 xx 10^(-27) erg s. .

The mass of the neutron is of the order of

It is known that atom contain protons. Neutrons and electrons. If the mass of neutron is assumed to half of its orginal value where as that of proton is assumed to be twice of its original value then the atomic mass of ._(6)^(14)C will be :-

Find the number of neutron and number of prorton if the element have number of electron 13 and mass number 27.

The total number of neutrons present in 54mL H_2O(l) are :

The total number of electrons in a nitrogen atom is 7. Find the number of valence electrons in it.

What is the mass of one atom of C(atomic mass 14)

A mixture of Ne and Ar kept in a closed vessel at 250 K has a total K.E.=3 kJ. The total mass of Ne and Ar is 30 g. Find mass % of Ne in gaseous mixture at 250 K.