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X gm A atoms on combining with Y atoms of B form 5 molecules of a compound containing A & B. Find the molecular weight of compound formed. (Atomic weight of B = M)

X gm A atoms on combining with Y atoms of B form 5 molecules of a compound containing A & B. Find the molecular weight of compound formed. (Atomic weight of B = M)

Grade:11

1 Answers

Harsh Tiwari
54 Points
2 years ago
We have been given A and B combines to form together 5 molecules of AB.
The reaction is supposed to occur as;
A+YB→5AB
We can find the molecular weight of compound AB as;
weight of A+weight of Y atoms of B=weight of 5 molecules AB -----------(1)
Weight of A= X gram (given)
Weight of B=M gram (given)
Since there are Y atoms of B , so therefore the weight of Y atoms of B=YM gram
Let suppose weight of AB= W gram 
Since, there are five molecules of AB formed, therefore,
Weight of 5 molecules of AB=5W
Now put all , these values in equation (1), we get;
X+YM=5W
W=(X+YM)/5 grams
Thus, when X gm A atoms combine with Y atoms of B to form 5 molecules of a compound containing A and B, then the molecular weight of the compound is (X+MY)/5.

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