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half life = 40minutes =2/3 hours
t(1/2)=(ln2 /k)
then k=(ln2/t(1/2)) = ln2/(2/3) = 3/2*(ln2)
origianl substance y0= 1000 grams
y=y0e-kt
y= 1000*(e-(3/2(ln2))*2 ) = 1000/8 = 125 grams
m= m0/2t/T
m=100 gms..
t=2 hours=2*60=120 min..
T=40 min
m=100/2120/40
m=100/23
m=100/8
m=12.5 gms.....
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