Question 1075882
If the half life of ibuprofen is 1.8 hours, then half of the original amount is present after that time. So, after 6 hours you have:
ln V=800 x (.5)^6/1.8
ln V=ln (800 x (.5)^3.33333)=ln 800 + ln (.5)^3.33333
ln V=ln 800 + 3.33333 ln 0.5=4.3741211258014429315635722024471
V=e^4.3741211258014429315635722024471=79.3700 mg of ibuprofen left after 6 hours. &#9786;&#9786;&#9786;&#9786;