Consider the equations below. CH,(9) →C(s)+2H2 (9) AH, = 74.6 kJ
C(s) + 2Cl2(g) → CCI (9) AH2 = -95.7 kJ
2H2(g) + 2Cl2(g) → 4HCI(9) AH2 = -184.6 kJ
CH, (g) + 4C12(g) → CCI,(9) + 4HCl(g) AH, = -205.7 kJ
Complete the following based on the diagram.
Arrow A:
Arrow B:
Arrow C:
Arrow D:

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