Consider the combustion reaction of propane: c3h8(g) + 5 o2(g) ® 3 co2(g) + 4 h2o(g), where dh = – 531 kcal/mol. if 6.70 ´ 104
kcal of energy is released in the reaction, how many grams of oxygen were consumed?

For which one of the following reactions is the value of δh° rxn equal to δh° f for the product? a. 2 h2 (g) + o2 (g) → 2 h2o (l) b. n2 (g) + o2 (g) → 2 no (g) c. 2 h2 (g) + o2 (g) → 2 h2o (g) d. h2o (l) + 1/2 o2 (g) → h2o2 (l) e. none of the above

Rocks, as they are compressed, begin forming mountains above the earth's surface when two continental plates converge. the continental crust increases in depth as the mountains grow above. the himalayan mountains formed at a convergent plate boundary in this manner. the rocks are smashed together causing them to due to the intense heat and pressure from the colliding plates and eventually forming rock. a) melt; igneous b) layer; sedimentary c) recrystallize; metamorphic d) melt into the earth's interior; metamorphic

Reactions in cells take place at about a. 40°c b. 0° c. 100°c d. 60°c