The combustion of propane is illustrated below. C3H3(g) + 502(9) --> 3CO2(g) + 4H2O(1) AH = -2550 kJ/mol.
1. If 18.0 grams of propane (44.11 g/mol) burns, how much energy will be produced?
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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.

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Read "who built the pyramids? ”. leave this link open while you answer the questions throughout the assignment. give at least two reasons why some people claim the pyramids of giza were constructed by aliens.