the specific heat of a gas is found to be 0.075 calories at constant volume & its formula weight is 40. the atimicity or the valency of the gas is ............

Answer 1

Is that specific heat per mole or per mass? I do not know what you mean by "atimicity", nor why a gas should have a valence.

Cv at normal temperatures is 3R/2 (about 3 Calories per mole) for monatomic and 5R/2 for diatomic gases. For polyatomics, the relationship is more complicated because some vibrational degrees of freedom start to be excited at normal temperatures. If your gas were were monatomic, the specific heat .075 Cal/g, and the molecular weight were 40 g/mole, Cv would be 3.0 cal/mole, which is consistent with the 3R/2 Cal/mole value for monatomics. If 0.075 Cal/g is the specific heat of your gas, the gas is probably argon.

Answer 2

I meant calories (gram-calories), not Calories (kg-calories). Ignore the capital C