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Mole to Mass and Mass to Mole
Tuesday, January 25, 2011 /12:54 PM

- some questions will give you an amount of moles and ask you to determine the mass
-converting moles to mass only requires one additional step

Ex: How many grams of Colbalt (II) Suplur are required to produce 1.2mol of Colbalt?
CoS --> Co + S   [balanced equation]

1.2mol Co x 1mol CoS = 1.2mol CoS
                    1mol Co
1.2mol CoS x 91g CoS    = 109.2
                     1mol CoS    = 109g

How many grams of Gold (III) Bromide are need to produce 3.7mol of Oxygen?
2AuBr3 + O3 ---> Au2O3 + 3Br2      [balanced equation]
3.7mol O x 2mol AuBr3 = 7.4 mol AuBr3
                         1 mol O
7.4mol AuBr3 x 436.7gAuBr3 = 1.6 x 103
                          2AuBr3

How many moles of Silver Iodide are required to produce 9.8g of Silver?
2AgI --> 2Ag + I2     [balanced equation]
9.8g Ag x 2mol Ag =0.1816mol Ag
                107.9Ag
0.1816mol Ag x  2mol AgI = 0.1816mol AgI
                            2molAg  = 0.18mol AgI

~christina :]