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science_rules
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Homework Statement
I have tried and tried and I can't figure out the factors to use on this:
a) What mass of P4 is required to combine with 0.398 grams (g) of Cl2 to produce PCl3?
b) What mass of PCl3 results when 0.398 g of Cl2 is combined with the calculated mass of P4?
I know that the equation is already balanced but I am not sure how to write the factors to get the answers. I am teaching myself, I'm not in chemistry class, so please be patient, thank you. I still haven't gotten the hang of using factors for stoichiometry problems.
Homework Equations
Equation to use: P4(s) + 6Cl2(g) ---> 4PCl3 (l) Unknown: P4 Known: 0.398g Cl2
I know that the atomic mass of Cl2 is 35.453 and the atomic mass of P4 is 30.973
The Attempt at a Solution
I tried using these factors but none of them yielded the right answers: 1 mole P4/6 mole Cl2, 1 mole PCl3/137.3 g PCl3, and 1 mole Cl2/70.906 g Cl2 but none of them work. Like I said, I tried to solve it using the factors but I cannot figure out which to use, they are confusing to me.
I started with 0.00561 moles of Cl2 times 1 mole P4/6 moles Cl2 and I crossed out the Cl2 which would give 0.000935 P4 which is not the answer. The answers are supposed to be 0.116 g P4 and 0.514 g PCl3