Uncharacteristically dazed, but after a reaction. E.g. Pb (s) + 2H SO. ->CO, + 2SC> + 2HO 2 4 2 2 2 i. So 12g of Carbon-12 represents one mole of ethanol used = 0.253/46 = 0.0055 moles of CH 4 (g) + 20 2 (g.