Binary compound of oxygen and an unknown element, x, has the formula xo2 and is 69.55 mass % oxygen, what is the weight of element x?

Weight of element X = 14.01 gram

Explanation:

Mass percentage is calculated by using :

Mass of O = 16.0 gram

let mass of X = X grams = ?

Mass of XO2 = mass of X + 2(mass of O)

Mass of XO2 = X + 2(16)

Mass of XO2 = X + 32

Total mass of O in the compound = 2(16) = 32 grams

Percent O = 69.55 %

weight of element X = 14.01 gram

14.01 is mass of nitrogen N

The correct formula of this element is NO2

a electronegativity decreases beacuse the size of nucleus is bigger.

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