Some Basic Concepts Of Chemistry Question 150

Question: X and Y are two elements which form $ X _2Y _3 $ and $ X _3Y _4 $ . If 0.20 mol of $ X _2Y _2, $ weighs 32.0 g and 0.4 mol of $ X _3Y _4 $ weighs 92.8 g, the atomic weights of X and Y are respectively

Options:

A) 16.0 and 56.0

B) 8.0 and 28.0

C) 56.0 and 16.0

D) 28.0 and 8.0

Show Answer

Answer:

Correct Answer: A

Solution:

[a] $ \frac{32}{2x+3y}=0.2;\frac{92.8}{3x+4y}=0.4 $ Hence: $ x=56\And y=16 $ .



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