Elements X and Y form a compound in which there is one
atom of X for every four atoms of Y. When these elements
react, it is found that 1.00 g of X combines with 5.07 g of
Y. When 1.00 g of X combines with 1.14 g of O, it forms a
compound containing two atoms of O for each atom of X.
Calculate the atomic mass of Y.
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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
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