Respuesta :

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We calculate the molar mass of element X as follows:

No. of moles = 48/16 = 3.2 mol

Mass of X2 = 64.8 - 48 = 16.8 g

2 molesX/5 mole O= x/ 3.00 moles O 

x = 1.2 moles of X 

Molar mass = 16.8g/ 1.2 mol = 14 g/mol

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