An equimolar mixture of CH4(g) (M=16g mol−1) and SF6(g) (M=146g mol−1) is allowed to effuse through a small orifice into vacuum at 350 K. After a short time, 10\% of the original CH4 molecules have escaped. Approximately what percentage of the original SF6 molecules has effused during the same time interval?
a) About 10%
b) About 1%
c) About 3%
d) About 30%