how to get the number of molecules within Benzoyl Peroxide?

Question

This is what I have so far but I don't know how to This is what I have so far but I don't know how to get the number of molecules within Benzoyl Peroxide?Benzoyl Peroxide aqueous Base, Acne Treatment Gel contains 10% of benzoyl peroxide (C14H10O4)

Molar mass of benzoyl peroxide is (2x14) + (1x10) + (16x4) = 168 + 10 + 64 = 242 g/mol

Benzoyl Peroxide aqueous Base, Acne Treatment Gel contains 10% of benzoyl peroxide (C14H10O4)

Molar mass of benzoyl peroxide is (2x14) + (1x10) + (16x4) = 168 + 10 + 64 = 242 g/mol

Answer 1

You need the mass of the benzoyl peroxide to find the number of moles of the benzoyl peroxide, then multiply mole number by avogadro's number to find the molecule number.

grams BP x 1 mole/242 grams x 6.02 e²⁴ molecules/ mole = molecule #

Or if given tube mass, multiply by 10% to get grams of BP

grams of tube X 0.10 = grams BP(see above steps to get molecule number)