A compound is broken down into 34.5 g of element A, 18.2 g of element B, and 2.6 g of element C. What is the percent (by mass) of each element?

1 Answer
anor277
Oct 10, 2016

#A=62.3%,B=33.0%,C=4.70%#.

Explanation:

#%A# #=# #(34.5*g)/(34.5*g+18.2*g+2.6*g)xx100%=62.3%#

#%B# #=# #(18.2*g)/(34.5*g+18.2*g+2.6*g)xx100%=33.0%#

#%C# #=# #(2.6*g)/(34.5*g+18.2*g+2.6*g)xx100%=4.70%#

That is #%" element"# #=# #"Mass of element"/"Mass of compound"xx100%#

#"Mass of compound"# is clearly the SUM of the constituent elements.

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