Chemistry Equation Question: pls show your consequences?

Atomic mass of X = 35.5g

Molar mass of X₂ = 2x35.5 = 71g

14.2g of X₂ are used, which is 14.2/71 mol = 0.2mol of X₂

From the equation:

2NaY + X₂ → Y₂ + 2NaX

we can see for each mole X₂ used, 1 mole of Y₂ is produced.

Therefore 0.2mol of Y₂ are produced and this weighs 50.8g.

Molar mass of Y₂ 50.8/0.2 = 254g

Atomic mass of Y = 254/2 = 127g

Relative atomic mass of Y = 127 (which corresponds to iodine)

2NaY + X2 = 2NaX + Y2

Molar ratios are 2:1::2:1

From the Periodic Table

Ar = 35.5 is Chlorine

moles(Cl2) = 14.2 / ( 2 x 35.5) = = 14.2/71 = 1/5 = 0.2 ( equivalent to '1' in the molar ratios above)

Hence moles of Y2 = 0.2 ( Also equivalent to '1' in the molar ratios above).

Mr(Y2) = 50.8/0.2 = 50.8 X 5/1 = 254.0

Ar (Y) = 254.0/2 = 127.0

From the Periodic Table element with an At of 127.0 is IODINE.