The eight environmental factors effecting the rate of respiration are: (1) Oxygen Content of the Atmosphere (2) Effect of Temperature (3) Effect of Light (4) Effect of Water Contents (5) Effect of Respirable Material (6) Effect of Carbon Dioxide Concentration (7) Protoplasmic Conditions and (8) Other Factors.
Molar mass of sodium=23g 2 mole sodium gives 2 g H2 i.e 46g sodium gives 2g H2 so 65.4g will give=2.84g H2 now no. of molecules = 2.8/2*avogadros number