Suppose the elements X and Y combine to form two compounds XY_2 and X_3Y_2 . When 0.1 mole of XY_2 weighs 10 g and 0.05 mole of X_3Y_2 weighs 9 g , th - Chemistry MCQ Chemistry | ExamTest.live

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Suppose the elements X and Y combine to form two compounds XY_{2} and X_{3} Y_{2} . When 0.1 mole of XY_{2} weighs 10 g and 0.05 mole of X_{3} Y_{2} weighs 9 g, the atomic weights of X and Y are:

A $30, 20$
B $40, 30$
C $60, 40$
D $20, 30$

Solution & Step-by-step Explanation

Let atomic weight of X be x and Y be y .For XY_{2} :Molar mass = x + 2 y Mass = moles \times Molar mass 10 = 0.1 \times (x + 2 y) \Rightarrow x + 2 y = 100 --(Eq 1)For X_{3} Y_{2} :Molar mass = 3 x + 2 y 9 = 0.05 \times (3 x + 2 y) \Rightarrow 3 x + 2 y = 180 --(Eq 2)Subtract (Eq 1) from (Eq 2): 2 x = 80 \Rightarrow x = 40 Substitute x = 40 in (Eq 1): 40 + 2 y = 100 \Rightarrow 2 y = 60 \Rightarrow y = 30 Atomic weights: X = 40, Y = 30 .

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Suppose the elements X and Y combine to form two compounds XY_{2} and X_{3} Y_{2} . When 0.1 mole of XY_{2} weighs 10 g and 0.05 mole of X_{3} Y_{2} weighs 9 g, the atomic weights of X and Y are:

30, 20

40, 30

60, 40

20, 30

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Basic Concepts of Chemistry Stoichiometry Atomic Mass

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Suppose the elements $X$ and $Y$ combine to form two compounds $XY_{2}$ and $X_{3} Y_{2}$ . When $0.1 mole$ of $XY_{2}$ weighs $10 g$ and $0.05 mole$ of $X_{3} Y_{2}$ weighs $9 g$ , the atomic weights of $X$ and $Y$ are:

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Suppose the elements X and Y combine to form two compounds XY2​ and X3​Y2​. When 0.1mole of XY2​ weighs 10g and 0.05mole of X3​Y2​ weighs 9g, the atomic weights of X and Y are:

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Discussion

Suppose the elements $X$ and $Y$ combine to form two compounds $XY_{2}$ and $X_{3} Y_{2}$ . When $0.1 mole$ of $XY_{2}$ weighs $10 g$ and $0.05 mole$ of $X_{3} Y_{2}$ weighs $9 g$ , the atomic weights of $X$ and $Y$ are: