2 Part Stoichem solving

timer Asked: Jul 24th, 2015

Question description

A) A sample of the male sex hormone testosterone, C19H28O2, contains 7.04 x 10^20 hydrogen atoms, 4.78 x 10^20 carbon atoms, 2.51 x 10^19 molecules of testosterone, 4.18 x 10^-5 moles of testosterone.

WHAT is the mass of this sample in grams?

B) Washing soda, a compound used to prepare hard water for washing laundry, is a hydrate, which means that a certain number of water molecules are included in the solid structure. Its formula can be written as Na2CO3·x H2O, where x is the number of moles of H2O per mole of Na2CO3. When a 2.396-g sample of washing soda is heated at 125°C, all the water of hydration is lost, leaving 0.887 g of Na2CO3. 


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