A mixture of one mole each of H2, He, and O2 each are enclosed in a cylinder of volume V at temperature T. If the partial pressure of H2 is 2 atm,the total pressure of the gases in the cylinder is :
An element crystallites in a face centered cubic (fcc) unit cell with cell edge a. The distance between the centre of two nearest octahedral voids in the crystal lattice is:
A diatomic molecule X2 has a body-centred cubic (bcc) structure with a cell edge of 300 pm. The density of the molecule is . The number of molecules present in 200 g of X2 is :
(Avogadro constant )