Question

Elements X and Y form a compound in which there is 1 atom of X for every 4 atoms of Y. when these elements combine, it is found that 1.00g of X combines with 5.07g of Y. when 1.00 g of X combines with 1.14 g of O, I it forms a compound containing 2 atoms of O for each atom of X. Calculate the atomic mass of Y.​

Answer 1

Answer

Molecular formula =XY

2

Z

3

10

23

, atomic weight of Y=y

Molecular mass =60+240+2y

=300+2y

1.15×10

23

atoms of Y≃2 mol of Y

∴ Limiting agent is Z .

∴ No. of moles of compound =

3

0.03

=0.01

∴ Molecular mass =

0.01

4.40

=440

⇒300+2y=440

⇒y=70

Answer 2

Answer:

Molecular formula =XY2Z3

1023 , atomic weight of Y=y

Molecular mass =60+240+2y

=300+2y

1.15×1023 atoms of Y≃2 mol of Y

∴ Limiting agent is Z .

∴ No. of moles of compound =30.03=0.01

∴ Molecular mass =0.014.40=440

⇒300+2y=440

⇒y=70