Answers only please 100pts and brainliest. you will be reported for wrong answers.

5) use PV=nRT

R is 8.31

the rest apply values to P,V,and T

and convert to standard units if u have to ..

u ll get n=5.56

then n=mass÷Ar of Kr

substitute n and Ar of Kr from periodic table to get mass of Kr ...

hope i helped

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.