When a compound containing C,H, and O is completely combusted in air, what reactant besides the hydrocarbon is involved in the reaction? Express your answer as a chemical formula including phase. Determine the formula weights of each of the following compounds. Ethylene, C2H4, a olorless gas used to produce polyethylene. Express your answer in atomic mass units to one decimal place. Benzoic acid, HC7H5O2, a substance used as a food preservative. Express your answer in atomic mass units to one decimal place. Ammophos, (NH4)2HPO4, a major ingredient of agricultural fertilizers. Express your answer in atomic mass units to one decimal place. Myrcene, C10H16, an aromatic molecule found in herbs and spices such as thyme, hops, cannabis, and cardamom. Express your answer in atomic mass units to one decimal place. Ethyl butyrate, C3H7COOC2H5, the molecule largely responsible for the odor of pineapple. Express your answer in atomic mass units to one decimal place. Calculate the percentage by mass of the indicated element in the following compounds. Carbon in acetylene, C2H2 a gas used in welding Express your answer in percentage terms to three significant figures. Hydrogen in ascorbic acid, HC6H7O6, also known as vitamin C Express your answer in percentage terms to two decimal places. Hydrogen in ammonium sulfate, (NH4)2SO4, a substance used as a nitrogen fertilizer Express your answer in percentage terms to two significant figures. he indicated Platinum in PtCl2(NH3)2, a chemotherapy agent called cisplatin Express your answer in percentage terms to four significant figures. indicated Oxygen in the female sex hormone estradiol, C18H24O2 Express your answer in percentage terms to three significant figures. Carbon in capsaicin, C18H27NO3, the compound that gives the hot taste to chili peppers Express your answer in percentage terms to three significant figures