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What is the percent composition of chlorine in PCl5?

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out of 6 atoms, five are Cl
However by mass it is
(100)(5*35.5) /(5*35.5 + 31)

31.0 + 5(35.5) = 208.5

35.5 x 5= 177.5

177.5% 208.5 x 100% = 85%

Yes but you intended to type:
(177.5 / 208.5) x 100% = 85%

yes thank you Damon !!!

You are welcome.

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