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LeChatNoir
X₂O₃ ===> 3 moles of oxygen == > 48 g O

Molar mass of X₂O₃-------------- 48g O
30,6g --------------------------------- 14,4g

Molar mass = (30,6×48)/14,4
Molar mass = 102g

Molar mass of X₂ = 102 - 48 = 54g
Molar mass of X = 54/2 = 27g

X ==> 27 g/mol ==> Al
X₂O₃ ==> Al₂O₃

:)
maacastrobr

Answer:

27 g/mol

Explanation:

To calculate the molar mass of element X, we need to calculate the mass in a given number of moles.

  • The moles of X can be calculated by using the ratio of O atoms to X atoms in the molecule:

[tex]14.4 g O*\frac{1molO}{16gO} *\frac{2molX}{3molO}=0.60 mol X[/tex]

  • The mass of X₂O₃ that is not oxygen, is element X. In other words, the mass of the atoms of the X element contained in the 30.6 g sample is:

30.6 g - 14.4 g = 16.2 g of X

Thus, the molar mass of element X is

16.2 g / 0.60 mol = 27 g/mol

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