ibuprofen (c13h1802) is the active ingredient in many nonprescription pain relievers. each tablet contains 200.0 mg
of ibuprofen. calculate the number of moles of ibuprofen in a single tablet.

answers:
9.694x10^-4
9.694x10^4
0.969
0.969

Explanation:

Let's firstly define how we calculate the number of moles. Moles are defined as the ratio between the mass of a substance (in this case, mass is 200.0 mg, or 0.2000 g) and the molar mass of that substance (this is what we'll need to determine).

Given the molecular formula of ibuprofen, let's calculate its molar mass adding the molar masses of each element and multiplying by the subscripts given in the molecular formula:

Now the solution is straightforward, dividing the mass in grams:

by the molar mass will yield moles:

b) nuclear ive learned that in a pedtrodic table

i believe the answer is three water molecules