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July 28, 2014

Homework Help: ChemistryDrBob222 could you please check this over

Posted by ella on Monday, February 13, 2012 at 6:11am.

0.281g of Fe(NH4)2(SO4)2*6H2O is dissolved in a total volume of 500.0 mL of water, calculate the resulting Fe concentration in ppm.

molar mass of Fe(NH4)2(SO4)2*6H2O = 392.14088g/mol

molar mass of Fe = 55.845g/mol

0.281g * (1mol/392.14088g) = 7.165X10^-4 mol

7.165X10^-4 mol * (1mol Fe/ 1mol Fe(NH4)2(SO4)2*6H2O) = 7.165X10^-4 mol Fe

7.165X10^-4 mol (55.845g Fe/ 1 mol Fe) = 0.040017g Fe

0.040017g Fe / 500.0mL = 8.003X10^-5g/mL

(8.003X10^-5g/mL)(1000mL/L) = 0.08003g/L

(0.08003g/L)(1000mg/g) = 80.0mg/L

80.0mg/L = 80.0 ppm since 1mg/L = 1ppm

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