suppose two elements X and Y combine to form two compounds XY2and X2Y3when 0.05 mole of XY2weighs 5g while 3.011×1023 molecules of X2Y3 weighs 85 g. The atomic masses of X and Y are respectively:

Mol . Wt, of XY2=50.05=100Mol.Wt.of X2Y3=853.011×1023×NA=170 Let molar mass of X and Y area and b respectively ∴a+2b=1002a+3b=170: a=40: b=30

suppose two elements X and Y combine to form two compounds XY2and X2Y3when 0.05 mole of XY2weighs 5g while 3.011×1023 molecules of X2Y3 weighs 85 g. The atomic masses of X and Y are respectively:

Mol . Wt, of XY2=50.05=100Mol.Wt.of X2Y3=853.011×1023×NA=170 Let molar mass of X and Y area and b respectively ∴a+2b=1002a+3b=170: a=40: b=30

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suppose two elements X and Y combine to form two compounds $X Y_{2}$ and $X_{2} Y_{3}$ when 0.05 mole of $X Y_{2}$ weighs $5 g$ while $3.011 \times 10^{23}$ molecules of $X_{2} Y_{3}$ weighs 85 g. The atomic masses of X and Y are respectively:

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20,30

30,40

40,30

80,60

answer is C.

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Mol . Wt, of $X Y_{2} = \frac{5}{0.05} = 100$

Mol.Wt.of $X_{2} Y_{3} = \frac{85}{3.011 \times 10^{23}} \times N_{A} = 170$

Let molar mass of $X$ and $Y$ area and b respectively

$∴ a + 2 b = 100$

$2 a + 3 b = 170 :$

$a = 40 :$

$b = 30$

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suppose two elements X and Y combine to form two compounds XY2and X2Y3when 0.05 mole of XY2weighs 5g while 3.011×1023 molecules of X2Y3 weighs 85 g. The atomic masses of X and Y are respectively:

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suppose two elements X and Y combine to form two compounds $X Y_{2}$ and $X_{2} Y_{3}$ when 0.05 mole of $X Y_{2}$ weighs $5 g$ while $3.011 \times 10^{23}$ molecules of $X_{2} Y_{3}$ weighs 85 g. The atomic masses of X and Y are respectively: