The following data were obtained during the first order thermal decomposition of SO₂Cl₂ at a constant volume:

SO₂Cl₂(g) → SO₂(g) + Cl₂(g)

Experiment Time/ s^-1 Total pressure/atm

1 0 0.4

2 100 0.7

Calculate the rate constant.

(Given: log 4 = 0.6021, log 2 =0.3010)