2007-09-19 12:49:48 · 3 answers · asked by J L 2 in Science & Mathematics ➔ Chemistry
add the molecular (or 'atomic') weights of Barium+
2x Nitrogen+ 6 xOxygen= molecular wt of Ba(N03)2
then take the 500 grams of material and divide by the molecular wt to get the number of gram-moles.
ie 500gms/mw(atomic mass units)=number of gram-moles
2007-09-19 12:59:51 · answer #1 · answered by 2hard4me 3 · 0⤊ 0⤋
To solve this, remember that mass is directly related to count of molecules. The ratio of mass in grams to moles is the Molar mass which is found from the sum of the masses of the elements in the compound.
Molar mass Ba(NO3)2 = 137 (mass of Ba) + 14 (mass of N) x 2 (two nitrogens in the formula) + 16 (mass of O) x 6 = 261 g/mol
Moles = grams / molar mass = 500 / 261 = 1.92 moles
A similar process is needed for the Tin (II) chloride, just different molar mass.
2007-09-19 12:58:58 · answer #2 · answered by lhvinny 7 · 0⤊ 0⤋
None if you put up a good fence around it.
2007-09-19 12:55:40 · answer #3 · answered by Nash 6 · 0⤊ 0⤋