Please show work

What pressure is exerted by 0.450 mol of a gas at 25°C if the gas is in a 0.650-L container?

Me i dont know what to do! the table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

Which of the following would have less momentum than a 52 kg cheetah running at 10 m/s?

Acontrol during an experiment. might change remains constant does not exist does change