[quinnman]

This might be a silly question but anyway. Is atomic (molecular) weight dependent on temperature?
Thank you for your patience.

[P]

ATOMIC weight is what defines an element so no it is not dependent on temp.

Molecular weight is a determined thing too made up of the sum of the atomic weights of all the atoms in the molecule so - no it's not dependent on temp for a defined molecule.

The only possible dependents I could think of would be in a polymerisation, where the rate of reaction could be changed by increasing or decreasing the temperature, so, the resulting polymer could have a different molecular weight if the reaction temperatures were different. But I don't think that is what you were asking.