A gas enclosed in a cylinder is expanded to double its initial volume at a constant pressure of one atmosphere. The work done in this process is:

a) 5.05 × 10⁵ J
b) 5.05 × 10⁴ J
c) 5.05 × 10⁻⁵ J
d) 5.05 × 10⁻⁴ J