The standard internal energy change for a reaction can be symbolized as δu°rxn or δe°rxn. for the following reaction equations, calculate the energy change of the reaction at 25 °c and 1.00 bar. sn(s)+cl2(g) > sncl4(l) + h(kjmol) -511.3. h2(g)+cl2(g) > 2hcl(g) + h(kjmol) -184.6

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