moles/limiting reagents/stoichiometry problem?

Question

A student reacts 156 g of C2H4(g), 290 g of Bromine(g) and 354 g of Chlorine (g) to form C2H4ClBr(g).

1. Write out the balanced chemical reaction.
2. Which reactant is the limiting reagent?
3. How many moles of C2H4ClBr will be produced?
4. What mass of C2H4ClBr will be produced?
5. After the reaction is completed how many moles of each reactant will remain?

Answer 1

If I remember my chemistry class right it goes as follows.

1. Since C2H4 has a 2+ charge and both Cl and Br have a 1- charge, the balanced reaction should look like this: 1C2H4+ 1Cl+ 1Br-->1C2H4ClBr.

2. Since each reactant requires 1 Mole the limiting reactant is the one which you have the fewest Moles of. The moler mass of C2H4 is 36.072 so you have 156/36.072 of C2H4. Cl has a mass of 35.45 so you have 354/35.45 (aprox. 10) moles of Cl. Bromine has a mm of 79.9g so you have 290/79.9 moles of Br. I haven't figured it out, but I think Br will be your limiting reactant.

3. According to the equation for each mole of your limiting reactant you will produce 1 mole of C2H4ClBr. So you will produce 290/79.9 moles of C2H4ClBr.

4. For this one you will times the molar mass of C2H4ClBr by 290/79.9 and this will give you how many grams you have of each.

5. We have already figured out how many moles we have of each reactant in order to determine the limiting reactant. To find how much is left we subtract 290/79.9 moles from the amoutn we started with. This should give you 0 for Br. And a positive number for the others. if either of them are negative, you need to start over using that element as your limiting reactant.

Guess I was a bit off. It's been a couple of years; I guess I forgot that Cl and Br only existed as Cl2 and Br2 in gaseous state.

Answer 2

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Answer 3

1) 2(C2H4) + Br2 + Cl2 --> 2(C2H4ClBr) (because both bromine and chlorine are diatomic ions, they need the 2 after them when they are alone)
2) Bromine
3) 3.63 moles
4) 520.19 g.
5) 1.95 moles of C2H4, 0 moles of Bromine, and 1.41 moles of Chlorine

Those should be right

Answer 4

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