What is the density (in g/l) of a gas with a molar mass of 32.49 g/mol at 2.569 atm and 458 k?

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Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.

Displacement is the slope of a velocity vs. time graph a. true b. false