By using the following reactions, calculate the heat of combustion of pentane: C5H12(g)+8O2(g)→5CO2(g)+6H2O(l) . C(s)+O2(g)→CO2(g), △H=−395 kJ H2(g)+12O2(g)→H2O(l), △H=−285 kJ 5C(s)+6H2(g)→C5H12(g), △H=−147 kJ −5.42×103 kJ −3.54×103 kJ −2.85×103 kJ −6.80×103 kJ

Find the number of grams of hcl needed to react completely with .50 moles of magnesium.

Astudent is trying to create a table that compares hypotheses, theories, and laws. hypothesis theory law do scientific researchers formulate it? yes yes yes does it explain why things happen? yes yes no yes yes yes is it used to make predictions? no yes yes which of the following questions would most likely fill the blank in the table? is it an intelligent guess? is it newly formulated? is it based on observations? has it been proved?

Select the word from the list that best fits the definition the nuclear family into which a person is born or adopted.