What two mole ratios can be derived from the equation below, between hydrogen peroxide (H2O2) and water?
2 H2O2 → 2 H2O + O2

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:

pie chart because it is in percents ( % )

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a