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Q.

Suppose elements X and Y combine to form two compounds XY, and X3Y2 when 0.1 mole of former weigh 10 g while 0.05 mole of the latter weigh 9 g. What are the atomic weights of X and Y.

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a

40,30

b

60,40

c

20, 30

d

30,20

answer is A.

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Detailed Solution

i. X+2Y → XY20.1 mol of XY2=10g1 mol of XY2=100gii. 3X+2Y → X3Y20.05 mol of X3Y2 =9g1 mol of X3Y2 = 90.05=180g∴X+2Y=1003X+2Y=180MwXY2=100MwX2Y3=180Solve for X and YX=40gY=30g
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