A mass of one atom of carbon is about 2 x 10^-23 grams and the mass of an oxygen atom is about 2.66x10^-23 grams. A molecule of carbon dioxide gas(CO2) has two atoms of oxygen and one atom of carbon.

(a) Calculate the mass of one carbon dioxide molecule.

(b) Calculate the number of molecules in 1 gram of carbon dioxide gas.
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Apath 3 m wide runs around the inside of a square park inside 60 m.find the area of the path.pls

Which graph represents the solution set for the given system of inequalities? x+2y< 3 x+y> 4 3x-2y> 4

In the following diagram it is given that dec,ab || dc, ad || eb, and ad is congruent to bc. a)why isn't abc a parallelogram even though it has a pair of parallel sides and a pair of congruent sides b)explain why be must be congruent to bc. further explain what type of triangle this makes triangle abc and what it tells you about angle 1 and angle 2c) finally why must angle 3 be congruent to angle 1? further, explain why we know that angle 3 is congruent to angle 2