A gas occupies 250mL, and it's pressure is 0.724 atm at 25 degrees c. r = 0.0821 L•atm/mol•k. Solve for moles !! Pl

in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

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explanation: no but i do not usually comment