3X+4Y-->5Z...When 2.5 moles of X react with 1.8 moles of Y, 61 grams of Z are produced.?

Question

What is the molar mass of Z? There is a 50 % yield...I think this means i just divide my answer by 2...

Answer 1

4 moles of Y need 3 moles of X

1.8 moles of Y = 1.8*3/4 = 1.35 moles of X

Thus Y is the limiting reagent.

4 moles of Y make 5 moles of Z

1.8 moles of Y = 1.8*5/4 = 2.25 moles of Z

If there is 50 % yield then 2.25/2 = 1.125 moles of Z have been produced which weigh 61 g

So, 1 mole of Z weighs 61/1.125 g = 54.22 g

Answer 2

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Answer 3

Although it is 2.5moles of X, but only part of them reacted with Y.

4=1.8
3=1.35moles of X.

5 part of X is equivalent to 2.25moles.
2.25moles=61g.
1mol=61/2.25=27.11g

I hope this helps.:)