The 54.9-g sample of the compound x2o7 contains 33.6 g of oxygen atoms. what is the molar mass of element x?

The molar mass of element X is 35.5 g/mol

Explanation:

We are given:

A chemical compound having formula

1 mole of this compound contains 2 moles of element X and 7 moles of oxygen

Mass of oxygen atoms = 33.6 grams

Mass of sample = 54.9 g

Mass of X atoms = (54.9 - 33.6)g = 21.3 g

We know that:

Molar mass of oxygen = 16 g/mol

To calculate the molar mass of element X, we use unitary method:

33.6 g of oxygen combines with 21.3 g of element X.

So, of oxygen atom will combine with of element X

From the given formula, 2 moles of element X are present.

So, molar mass of element X =

Hence, the molar mass of element X is 35.5 g/mol

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