Mrs Watts

Exponential growth a = initial amount before measuring growth/decay ($1000) r = growth/decay rate (often a percent)(5% or .05) x = number of time intervals that have passed (20 years) y=a(1+r)^20

sorry...the formula should read y=a(1+r)^x

Ok, 1 mol of N is 14gm (its atomic weight), so 1 mol of N2 would be 28 gm. Then just multiply 28 by 6.3 to get your answer.