a. 7.409E21 f.u. sodium chloride
b. 3.83E22 molecules C64H128O2 (chocolate is accurately a mixture where the main ingredient is cocoa. They believe cocoa is made up of thembroma oil, which they believe the chemical formula of this oil is C64H128O2, so that is what we are using here)
c. 7.90E23 molecules C12H22O11 (sucrose or table sugar)
d. 1.54E23 molecules C18H34O2 (margarine is also a mixture where one type of margarine, the main ingredient is oleic acid,C18H34O2, which we will assume is margarine).