help with chemistry?

Question

Platinol is an anticancer drug with molecular formula Pt(NH3)2Cl2. Platinum is a precious metal, and the cost of making platinol is determined by the cost of the platinum, which is $19.00 per gram. One dose of the drug contains 11.9 mg of platinol. How many doses of platinol could be produced for 71.8 dollars?

Answer 1

this is a simple math question.
it's dimensional analysis.
You take your given, $71.80. find out how many grams you can buy.
That's just $71.80 * 1gram/$19.00. Now that you have grams you have to divide it by the dosage amount (in grams) to see how many doses you can make.

Answer 2

First: find how many mg of platinum can be purchased for $ 71.80. Call that "A" mg

Next: Find the amount of platinum in 11.9 mg of platinol. This will require knowing the atomic weight of platinum and the mol wt of platinol.
The relation is (amt Pt)= 11.9*at wt Pt/mol wt platinol= Call that "B" mg.

Finally, divide A by B to get answer. Rough estimate, about 300-400.