# The compound of some element has the formula E2O3, and the mass fraction of the element in it is 68.42%. Install the item.

September 12, 2021 | education

| To start solving, we write down the oxide formula of this element and find the percentage of oxygen in it:

W (O) = 100% – 68.42% = 31.58%

The ratio of the number of their atoms in the oxide is 2/3 or 1 / 1.5.

To find the molar mass of an element, you need to write down the proportion:

0.6842 – 0.3158

M – 16

Location: 0.6842 / M = 0.0197

The element content will be one and a half times less than the oxygen content:

0.6842 / M = 0.0197 / 1.5

0.6842 / M = 0.0137

Whence M is equal to: 0.6842 / 0.0131 = 52.2 g / mol

According to the periodic table, this element is chrome!

Cr2O3 oxide formula

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