a 1.4g sample of pure gas occupies a volume of 981 mL at 42°C and 117 kPa. Determine the molar mass of the compound.

51 g/mol. Explanation: Whenever you see molar masses in gas law questions, more often than not density will be involved.

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.

explanation:

i don't see a text, but i am gonna assume this *orbit* the curved path, usually elliptical, described by a planet, satellite, spaceship, etc., around a celestial body, as the sun.