In an experiment, it is found that of pure X produces of pure . The number of moles of X is:

Question

In an experiment, it is found that  of pure X produces  of pure . The number of moles of X is:

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Strategy:
 To find the number of moles of an element X in a compound, we can use the mass of oxygen reacted to determine the proportion of X. By knowing the molecular formula (), we relate the moles of oxygen to the moles of X using stoichiometry.

Step 1: Calculate the mass of reacting oxygen
Mass of oxygen 
Mass of oxygen

Step 2: Calculate moles of oxygen atoms

Step 3: Use stoichiometric ratio to find moles of X
From the formula , we know that 2 moles of  combine with 5 moles of .

(Note:

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