Question

In an experiment, it is found that 2.0769g of pure X produces 3.6769g of pure X2O5. The number of moles of X is

Answer 1

the chemical equation is ..
2X + 5/2 O2 → X205
so the mass of Oxygen using the law of conservation of mass = 3.6769 - 2.0769
so the mass oxygen is = 1.6 g

no. of mole of Oxygen = given mass / molar mass
so the no. of moles for oxygen. is 1.6/32 = 0.05 moles
as 5/2 moles of O2 reacts with 2 moles of X
then ,
5/2 moles of O2 → 2 moles of X
and 0.05 moles of O2 reacts with → 4 × 0.05 /5 moles of X ...
so the no. of moles are 0.04
which is your answer ....

Answer 2

Answer:

The chemical equation is

2X+5/2 O2 ----->X2O5

so the mass of oxygen is =1.6g.

no. of mole of o2= givenmass/molar mass

no. of moles of o2 = 1.6/32 =0.005 mole

as 5/2moles of o2 reacts with 2 moles of x then ,

5/2moles of o2 --->moles of x.

and 0.05 moles of o2 reacts with---->4×0.005/5moles of x

so ,the no. of moles are 0.04....

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