Given 95 Grams of Cr2o3

Take Home Quiz: Chem 1211- Quiz 4 Name: ______Section: ______

DUE DATE: At the beginning of class on Monday, Sept. 12, 2016. Show ALL WORK for full credit. No LATE work accepted.

Given 76.85 grams of ammonium phosphate, determine the following: (Pay attention to Sig. Figs.) Circle your answer.

a.) the molar mass of ammonium phosphate.

b.) the number of moles of ammonium phosphate.

c.) the number of moles of N.

d.) the number of moles of Oxygen.

e.) the number of molecules of ammonium phosphate.

f.) the number of atoms of H present in 76.85 grams of ammonium phosphate.

h.) the % by mass of N in ammonium phosphate?

i.) Calculate the mass in grams of 4.15 x 1025 molecules of potassium carbonate.