Friday
August 22, 2014

Homework Help: chemistry

Posted by Anonymous on Tuesday, March 24, 2009 at 11:42pm.

1.to calculate the percent by massof an element in a known compound, divide the mass of the element in one mole by the _______and multiply by 100%. A(n) _______formula represents the lowest________ratio of the elements in a compound. It can be calculated from a compond's percent composition.The ___________formula of a compound is either the same as its empirical formula
2.what is percent composition
3.what is empirical formula
4. what is molecular formula
5.what is the percent compition of the follwing:A=Cr2O3
B.Mn2P2O7
C.HgS
D.Ca(NO3)2
6.determine the empirical formula of the compound with the percent composition of 29.1%Na,40.5%S,and 30.4%O

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