What is the mass of 1.0 mole sample of krypton gas?

And krypton, $\text{Kr}$, with atomic number $36$, has a molar mass of $\text{83.798 g/mol}$.
That is by definition the mass of $\text{Kr}$ gas atoms for every $\text{1 mol}$ of krypton gas atoms. So, you already have your answer.
$\cancel{\text{1 mol" xx "83.798 g Kr"/cancel"mol" = color(blue)ul"83.798 g Kr}}$
You should get to know your periodic table well enough that you can at least name every non-$f$-block element, and find it on the table during an exam.