V(O2)=0.4м³ P=8.3×10⁵Па t⁰=47⁰C m=? N=?

m = V(O2) * P / (R * (t⁰ + 273))
m = 0.4 * 8.3 * 10⁵ / (287 * (47 + 273))
m = 11.06 кг
N = m / M(O2)
N = 11.06 / 0.032
N = 345.63 молей