49. Citric acid, C6H8O7, is found in many fruits. (i) What is the weight percent of carbon in the compound? (a) 37.5% (b) 4.2% (c) 58.3% (d) 18.8% (ii) If you have 100.mg in a can of soft drink, how many molecules of citric acid does this represent? (a) 6.261020 molecules (b) 3.131020 molecules (c) 3.131024 molecules (d) 3.131023 molecules (iii) How many O atoms are contained in 100.mg of the acid? (a) 2.191021 atoms (b) 4.471019 atoms (c) 3.131020 atoms (d) 6.021023 atoms