chapter 9 Flashcards
which is the molar mass of the element calcium?
40.078 g/mol
which element has a molar mass of 30.974 g/mol?
phosphorus
which is the correct molar mass for the compound FeSO4?
151.91 g/mol
which is the correct molar mass for the compound CaBr2?
200g/mol
which is the mass of 8 moles of sodium chloride?
468 grams
which is the percent composition of bromine in the compound NaBr?
77.7%
how many moles of atoms are in one mole of AlPO4?
122.1 moles
a sample of Manganese(II) chloride has a mass of 19.8 grams before heating, & 12.6 grams after heating until all the water is driven out. Based on this information, how many water molecules were attached to each molecule of Manganese(II) chloride?
2
find the formula for the compound that contains 72.40% iron & 27.60% oxygen.
Fe3O4
which term is described as the percent by mass of any element in a compound?
percent composition
how many formula units are in 3.6 grams of NaCl?
3.7•10^22
calculate the # of moles in 2.5 moles of sucrose.
1.51•10^24 molecules
calculate the number of molecules in 4.0 mol H2O
2.4•10^24
which is the percent composition of phosphorus in Zn3 (PO4)2?
16.1%
how many grams are in 1.946 moles of NaCl?
113.7g
