For the reaction of C2H4(g) with O2(g) to form CO2(g) and H2O(g), what number of grams of CO2 could be produced from 5.00 mol C2H4 and 12.1 mol of O2

An unknown substance is a white solid at room temperature and has a melting point of 78 °c. which of the following substances is most likely to be the identity of the unknown sample? a. naphthalene, a molecular solid with the formula c10h8 b. silica, a network solid held together by covalent bonds with the formula sio2 c. calcium chloride, an ionic compound with the formula cacl2 d. water, an molecular compound with the formula h2o