Calculate AH for the reaction, 5 C(s) + 6 H2(g) → C5H12(1) given the following information C5H12(1) + 8 O2(g) → 5 CO2(g) + 6 H2O(g) AH = -3,244.8 kJ
C(s) + O2(g) → CO2(g) AH = -393.5 kJ
2 H2(g) + O2(g) → 2 H2O(g) AH = -483.5 kJ
Select one:
a. 2,367.8 kJ
b. -173.2 kJ
C. -6,662.8 kJ
d. -4,121.8 kJ

Joseph has hypothesized that sound travels in waves. if he were following the scientific method, what should he do next? a. ask a question. b. test the hypothesis. c. study the results. d. tell other scientists about his hypothesis.

What reaction is taking place? 02 + c3h8 = h20 + co2

Which statement correctly describes metallic bonds? a. they form when certain atoms lose electrons and other atoms gain electrons. b. they involve an attraction between anions and cations. they always involvpoth a metal and a nonmetal. d. they can only form between atoms of the same element. e. they form because electrons can move freely between atoms.