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

Option A = 9.694 x 10⁻⁴

Explanation:

Data Given:

mass of Ibuprofen (C₁₃H₁₈0₂) = 200 mg

convert mg to g

1 mg = 0.001 g

200 mg = 0.001 x 200 = 0.2 g

no. of moles of Ibuprofen (C₁₃H₁₈0₂) = ?

Solution:

To find number of moles formula will be used

                no. of moles = mass in grams / Molar mass

So,

Molar mass Ibuprofen (C₁₃H₁₈0₂)  = 13(12) + 18(1) +2(16)

Molar mass Ibuprofen (C₁₃H₁₈0₂)  = 156 + 18 + 32

Molar mass Ibuprofen (C₁₃H₁₈0₂)  = 206 g/mol

Now

put the values in formula

                    no. of moles = 0.2 g / 206 g/mol

                    no. of moles = 9.694 x 10⁻⁴ mol

So

A is the correct option