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Formula Weights 
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#1
Oct1804, 06:19 PM

P: 1,237

Hello all
I encountered the following problems: What is the formula weight of: a. potassium phosphate b. iron(III) oxide c. diphosphorous pentasulfide I know that the formula for (a) is K2S04. Hence I know there are 2K's 1 S and 4 O's. After obtaining the atomic masses, I sum them all up. The answer is 212.3 amu but I dont get this. Any help would be appreciated Thanks! 


#2
Oct1904, 04:42 AM

P: 14

K=39.098
S=32.060 O=15.999 So: K2=78.197 S=32.060 O4=63.998 So: K2SO4=174.254 Do the same for the other ones. 


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