many portable gas heaters and grills use propane, c3h8(g). using enthalpies of formation, calculate the quantity of heat produced when 11.0 g of propane is completely combusted in air under standard conditions. assume that liquid water is forming.

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Based on calculations, students should have 10.4 grams of powder after conducting an experiment. the students get these results: 10.2 grams, 10.4 grams, 10.3 grams, 10.4 grams, and 10.5 grams. which words best describe this data? check all that apply. a- accurate b- falsified c-invalid d-precise e-redundant