A home owner uses 4.00×10³m of methane (CH₄) gas, (assume (CH₄) is an ideal gas) in a year to heat his home. Under the pressure of 1.0 atm and 300 K , mass of gas used is x × 10⁵ g . The value of x is____.(Nearest integer) (Given R = 0.083 Latm K⁻¹mol⁻¹)
