Question

Element A wt=75 combine with B wt=32 to form X. If 3 mole of B combine with 2 mole of A to give 1 mole of X then what is weight of 5 moles of X

Answer 1

Molecular weight of

A

2

B

3

=75×2+16×3=198

A2B3=75×2+16×3=198

198g of

A

2

B

3

A2B3

=150g of A

∴

∴

10g of

A

2

B

3

=

150×100

198

A2B3=150×100198

= 75.08g of A

Hence (b) is the correct answer.