Question

A and b are two elements which a2b3 and ab2 molecules

Answer 1

Answer:

here your answer

Explanation:

Given,

A and B are two elements which forms compounds AB2 and A2B3

Also,

Weight of 0.2 mole of AB2 = 8 g and

Weight of 0.1 mole of A2B3 = 7g

In the case of AB2,Number of moles of A = 0.2 moles of AB2 x 1 mole A1 mole AB2=0.2 moles ANumber of moles of B = 0.2 moles AB2 x 2 moles B 1 mole AB2=0.4 moles BIn the case of A2B3,Number of moles of A = 0.1 mole A2B3 x 2 moles A 1mole A2B3=0.2 moles ANumber of moles of B = 0.1 moles A2B3 x 3 moles B1 mole A2B3 =0.3 moles B

As per the given values,

For AB2,

0.2 moles A + 0.4 moles B = 8 g--------(1)

For A2B3,

0.2 moles A + 0.3 moles B = 7 g--------(2)

(1)-(2), we get,

0.1 mole B = 1 g

Thus,

1 g / 0.1 mole B = 10 g B/ mol B

Substitute 10 g B in (1),

0.2 moles A + 0.4 moles B (10 g B/ mol B) = 8g

0.2 moles A + 4 g B = 8g

0.2 moles A = 8g - 4g = 4 g

Thus,

4 g / 0.2 moles A = 20 g A/ mol A

Hence,

Atomic mass of A = 20 g/mol

Atomic mass of B = 10 g/mol

Answer 2

Answer:

atomic weight of A is 21.2

atomic weight of B is 18.8