At what pressure would 10 moles of br2 gas have a temperature of 333k in a 77l tank?

= 3.549 atm

Using the  PV = nRT

n =number of moles , P is the pressure, V is the volume , T is a constant and R is the Universal constant, 0.08206 L.atm.mol−1.

n = 10 moles

T = 333 K

V = 77 L

P = ?

P × 77 = 0.08206 × 10 × 333

P =  273.2598/77

  = 3.549 atm

it means there are 3 atoms of oxygen