Suppose that A and B form the compounds B2 A3 and B2 A. If 0.05 mole of B2 A3 weighs 9 g and 0.1 mole of B 2 A weighs 10 g, the atomic weight of A and B respectively are

Question

Suppose that A and B form the compounds B2 A3 and B2 A. If 0.05 mole of B2 A3 weighs 9 g and 0.1 mole of B 2 A weighs 10 g, the atomic weight of A and B respectively are (A) 30 and 40 (B) 40 and 30 (C) 20 and 5 (D) 15 and 20

Tardigrade Admin · Accepted Answer

Let the atomic mass of B=y g ; A=x g ln B 2 A 3 2 y +3 x = mol. mass of B 2 A 3=( text given weight / text mole ) 2 y+3 x=(9/0.05) g In B 2 A ∴ 2 y +x=(10/0.1) g Solving x and y x=40 y=30

Q. Suppose that $A$ and $B$ form the compounds $B_{2} A_{3}$ and $B_{2} A$ . If $0.05$ mole of $B_{2} A_{3}$ weighs $9 g$ and $0.1$ mole of $B_{2} A$ weighs $10 g$ , the atomic weight of $A$ and $B$ respectively are

30 and 40

40 and 30

20 and 5

15 and 20

Let the atomic mass of $B = y g; A = xg$
$ln B_{2} A_{3}$
$2 y + 3 x =$ mol. mass of $B_{2} A_{3} = \frac{given weight}{mole}$
$2 y + 3 x = \frac{9}{0.05} g$
In $B_{2} A$
$∴ 2 y + x = \frac{10}{0.1} g$
Solving $x$ and $y$
${x = 40 y = 30}$

Q. Suppose that A and B form the compounds B2​A3​ and B2​A. If 0.05 mole of B2​A3​ weighs 9g and 0.1 mole of B2​A weighs 10g, the atomic weight of A and B respectively are