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Question

Calculate the number of NaBr formula units formed when 50 NBr3 molecules and 57 NaOH formula units are made to react?
2NBr3+3NaOHN2+3NaBr+3HOBr

A
50
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B
57
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C
23
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D
25
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Solution

The correct option is B 57
We can treat the numbers of molecules or formula units in the exact same manner as we use moles.
Determining the limiting reagent, 2NBr3+3NaOHN2+3NaBr+3HOBr
2 moles of NBr3 reacts 3 moles of NaOH
50 moles of NBr3 will react with 32×50=75 moles of NaOH
NaOH is the limiting reagent.
Now, 3 moles of NaOH produce 3 moles of NaBr
So, 57 moles of NaOH will produce 57 moles of NaBr
Hence, 57 formula units of NaOH will produce 57 formula units of NaBr

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