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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: Alfeition on November 27, 2007, 09:06:27 PM

Title: HELP LIMITING REACTANTS AND PERCENT YIELD
Post by: Alfeition on November 27, 2007, 09:06:27 PM

Hello, I need to study for my chemistry exam, and it is about limiting ractants and percent yield. Could someone help me work out this problem?

Consider the following unbalanced reaction:

                P4(s) + F2(g) -----> PF3(g)

How many grams of F2 are needed to produce 120g of PF3 if the reaction has a 78.1% yield?

Title: Re: HELP LIMITING REACTANTS AND PERCENT YIELD
Post by: agrobert on November 27, 2007, 10:04:05 PM

Balance your reaction.

If 120 g PF₃ is 78.1% yield, then how many grams PF₃ is 100% yield?

Read your book...

Title: Re: HELP LIMITING REACTANTS AND PERCENT YIELD
Post by: enahs on November 27, 2007, 10:04:44 PM

Start by reading this link, and the by balancing the reaction and show us your attempt! (http://www.chemicalforums.com/index.php?topic=9037.0)