an oxide of arsenic = 0.927g
76% arsenic and 24% oxygen
calculate the mass of oxygen that combines with one mole of arsenic atoms to form the oxide of arsenic.
How many moles of oxygen atoms does this mass represent?
Posted by Kirsty on Tuesday, February 6, 2007 at 3:50pm.
an oxide of arsenic = 0.927g
76% arsenic and 24% oxygen
calculate the mass of oxygen that combines with one mole of arsenic atoms to form the oxide of arsenic.
How many moles of oxygen atoms does this mass represent?
Take a 100 g sample.
You will have 76% As.
You will have 24% O.
mols As = 76/74.9 =??
mols O = 24/16=??
Now divide both numbers by the smaller of the two numbers (this forces the smaller number to be 1.00) and this should provide the small whole numbers for the subscripts. If the ratios are small whole numbers, then multiply them to make small whole numbers; i.e., if the ratio is 1.01 to 2.02 we would use 1 to 2. If the ratio is 1.01 to 1.5, then the ratio is 2 to 3.
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