What does an egg need to hatch??

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?

If 90.0 grams of ethane reacted with excess chlorine,how many grams of dicarbon hexachloride would form

When balancing a chemical equation: