At what temperature is the average speed of oxygen molecules equal to 1.12*104m/s?

we will use the root mean squared speed of oxygen formula

v = (3RT) / M

T = vM/3R

where

v = 1.12x104 m/s; velocity

R = (8.31447 kg m2 s-2 K-1 mol-1) gas constant

M = 0.0319988 kg/mol; molar mass of oxygen

substituting the given values, we will get

T (K) = 14.37K or - 258.78 C

Oxygen molecules speed of 1.12x104 m/s is at temperature - 258.78C.