Suppose two elements - X- and - Y- combine to form -160-two compounds - XY-2- and - X-3 Y-2- - 0-1- mol of -160-former weighs - 10- g while - 0-05- mol of the latter -160-weighs - 9- g- The atomic masses of - X- and - Y- are- respectively- 60- and - 40- 30- and - 40- 40- and - 60- 40- and - 30-

The correct option is D 40 and 30 The molecular weight of XY_2=100.1=100 g/mol.The molecular #160;weight #160;of #160; #160; X_ ...

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Standard XII

Chemistry

Stoichiometric Calculations

Suppose two e...

Question

Suppose two elements $X$ and $Y$ combine to form two compounds $X Y_{2}$ and $X_{3} Y_{2}$ . $0.1$ mol of former weighs $10$ g while $0.05$ mol of the latter weighs $9$ g. The atomic masses of $X$ and $Y$ are, respectively:

60

and

40

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30

and

40

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40

and

30

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40

and

60

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Solution

The correct option is D $40$ and $30$
The molecular weight of $X Y_{2} = \frac{10}{0.1} = 100$ g/mol.
The molecular weight of $X_{3} Y_{2} = \frac{9}{0.05} = 180$ g/mol.
Let $a$ and $b$ represent the atomic masses of $X$ and $Y$ respectively.
The molecular weight of $X Y_{2} = a + 2 b = 100$ g/mol.
The molecular weight of $X_{3} Y_{2} = 3 a + 2 b = 180$ g/mol.
On solving these two equations, we get $a = 40$ and $b = 30$ .

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Suppose two elements X and Y combine to form two compounds XY2 and X3Y2. 0.1 mol of former weighs 10 g while 0.05 mol of the latter weighs 9 g. The atomic masses of X and Y are, respectively:

Suppose two elements $X$ and $Y$ combine to form two compounds $X Y_{2}$ and $X_{3} Y_{2}$ . $0.1$ mol of former weighs $10$ g while $0.05$ mol of the latter weighs $9$ g. The atomic masses of $X$ and $Y$ are, respectively: