A chemical equation is shown: C2H4 + O2 → CO2 + H2O

According to the law of conservation of mass, how many atoms of oxygen exist in the products of this reaction? (3 points)

Asample of the male sex hormone testosterone, c19h28o2, contains 3.88×10^21 atoms of hydrogen.(a) how many atoms of carbon does it contain? (b) how many molecules of testosterone does it contain? (c) how many moles of testosterone does it contain? (d) what is the mass of this sample in grams?

What is a property of a double replacement reaction

In the particles are arranged in a regular, repeating pattern. a)a crystalline liquid b)a crystalline solid c)all gases d)all solids