Dimensional Analysis problem 2...Quick 10?
12. If Gasp cigarettes have 5 mg tar and 0.4 mg nicotine per cigarette and there are 20. cigarettes per pack, how many packs of cigarettes would have to be smoked to coat your lungs with 4.0 oz (1/4 lb.) of tar? How many packs would you have to smoke to introduce your lungs to one gram of drug nicotine?
Comments
Well, first of all your math teacher is a preachy idiot. Your lungs do not get "coated" with even close to ALL of the tar contained in a cigarette when you smoke it, so technically this question can't be answered with the info given. If you want to answer it the way he or she wants you to, then first convert 4.0 ounces to milligrams. 1 oz = 28,350 mg so 4 oz = 141,750 mg. Now you have to figure out how many cigarettes it will take to "coat" your lungs.
141,750 mg (1 cigarette / 5 mg) = 28,350 cigarettes.
Divide by 20 to convert to packs: 28350/20 = 1417.5 packs
To find the number for one gram of nicotine do similar conversions.
1 gram = 1000 mg
1000 mg (1 cigarette / .4mg nicotine) = 2500 cigarettes
2500 cigarettes = 125 packs
Tell your math teacher to leave smoking facts to the health teachers.