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Suppose the elements X and Y combine to form two compounds XY2 and X3Y2. When 0.1 mole of XY2 weighs 10 g and 0.05 mole of X3Y2 weighs 9 g, the atomic weights of X and Y are
  • a)
    40, 30
  • b)
    60, 40
  • c)
    20, 30
  • d)
    30, 20
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
Suppose the elements X and Y combine to form two compounds XY2 and X3Y...
Let atomic weight of x = Mx
atomic weight of y = My
we know,
mole = weight /atomic weight
a/c to question,
mole of xy2 = 0.1
so,
0.1 = 10g/( Mx +2My)
Mx + 2My = 100g -------(1)
for x3y2 ; mole of x3y2 = 0.05
0.05 = 9/( 3Mx + 2My )
3Mx + 2My = 9/0.05 = 9× 20 = 180 g ---(2)
solve eqns (1) and (2)
2Mx = 80
Mx = 40g/mol
and My = 30g/mole
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Most Upvoted Answer
Suppose the elements X and Y combine to form two compounds XY2 and X3Y...
Given Information:
- Moles of XY2 = 0.1, Weight of XY2 = 10 g
- Moles of X3Y2 = 0.05, Weight of X3Y2 = 9 g

Calculating Molar Mass:
1. Molar mass of XY2 = (10 g / 0.1 mol) = 100 g/mol
2. Molar mass of X3Y2 = (9 g / 0.05 mol) = 180 g/mol

Let the atomic weight of X be 'x' and Y be 'y':
- The molar mass of XY2 can be written as x + 2y = 100
- The molar mass of X3Y2 can be written as 3x + 2y = 180

Solving the Equations:
1. Multiplying the first equation by 3, we get 3x + 6y = 300
2. Subtracting the second equation from the above, we get 4y = 120
3. Therefore, y = 30
4. Substituting the value of y in the first equation, we get x = 40

Therefore, the atomic weights of X and Y are:
- Atomic weight of X = 40
- Atomic weight of Y = 30
Therefore, the correct answer is option 'A' - 40, 30.
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Suppose the elements X and Y combine to form two compounds XY2 and X3Y2. When 0.1 mole of XY2 weighs 10 g and 0.05 mole of X3Y2 weighs 9 g, the atomic weights of X and Y area)40, 30b)60, 40c)20, 30d)30, 20Correct answer is option 'A'. Can you explain this answer?
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