If there are 0.064g of theobromine in a 43g chocolate bar, how many moles of theobromine are there?

If the problem is finding the moles of theobromine, then the 43 g chocolate is not really a necessary information. All you have to do is convert 0.064 g of theobromine to moles using molar mass. The molar mass of theobromine is 180.164 g/mol. So,

0.064 g (1 mol / 180.164 g) = 3.6 x10^-4 moles

The answer would be letter A or the first choice :)

In any atom of any element, you will find protons and neutrons in the nucleus of any atom