How many moles are there in 1.20 x 1025 particles of helium?

You would get 19.969 moles.

Explanation:

You would get 19.969 moles.

i think it is d. e because the next one is igneous.

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: