many portable gas heaters and grills use propane, c3h8(g). using enthalpies of formation, calculate the quantity of heat produced when 16.0 g of propane is completely combusted in air under standard conditions. assume that liquid water is forming.

How long must a student wait for feedback on how they did on the accuplacer? a. 1 day b. 1 week c. 1 month d. immediate feedback (no wait)

Of the 168 hours in a week as a full time student you should spend how many hours per week on school work?

In the image, layer a is the topmost layer. layer c contains fossils from the precambrian era. layer b contains dinosaur fossils, and layer a contains fossils of mammals. which two statements are supported by this evidence? 1. mammals lived before the precambrian era. 2. dinosaurs and mammals existed in the precambrian era. 3. dinosaurs evolved after precambrian organisms. 4. precambrian organisms evolved after dinosaurs. 5. precambrian organisms were the first life-forms to become fossilized, according to this sample.