When a hydrogen electron makes a transition from n = 3 to n…

When a hydrogen electron makes a transition from n = 3 to n = 1, which of the following statements is true? I. Energy is emitted. II. Energy is absorbed. III. The electron loses energy. IV. The electron gains energy. V. The electron cannot make this transition.

Given the heats of the following reactions:     ∆H°(kJ)…

Given the heats of the following reactions:     ∆H°(kJ) I. P4(s) + 6 Cl2(g) –> 4 PCl3(g) –1225.6 II. P4(s) + 5 O2(g) –> P4O10(s) –2967.3 III. PCl3(g) + Cl2(g) –> PCl5(g) –84.2 IV. PCl3(g) + O2(g) –> Cl3PO(g) –285.7 Calculate the value of ∆H° for the reaction below:          P4O10(s) + 6 PCl5(g) –> 10 Cl3PO(g)

Given the equation S(s) + O2(g) –> SO2(g), ∆H = –296 kJ, wh…

Given the equation S(s) + O2(g) –> SO2(g), ∆H = –296 kJ, which of the following statement(s) is (are) true?  I.  The reaction is exothermic.II.  When 0.500 mole sulfur is reacted, 148 kJ of energy is released.III.  When 32.0 g of sulfur are burned, 2.96 x 105 J of energy is released.