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Remember that it is given to find GRAM MOLE

Jessica Alice
Karnataka

Answer 1

Answer:

The Answer Is 2 . Hope It Helps Plz Mark as brainiest

Answer 2

Given :

Mass of Aluminium oxide = 0.051g

To find :

Number of gram moles of Aluminium ion

Formula used :

• Number of mole = mass ÷ molar mass

Additional points :

$\sf \:Molar \: mass \: of \: Aluminium \: oxide ( Al_{2}O_{3}) = (2 \times 27) + (3 \times 16) \\ \sf \:Molar \: mass \: of \: Aluminium \: oxide ( Al_{2}O_{3}) = 54 + 48 = \: 102g {mol}^{ - 1}$

Procedure :

1. Find moles of Al2O3

2. In one molecules of Al2O3 , there are 2 Aluminium ion , therefore in one mole of Al2O3 there will be 2 mole of aluminium ions

Solution :

Number of mole of Al2O3 = 0.051g ÷ 102

Number of mole of AL2O3 = 0.0005 moles

1 mole of Al2O3 contain 2 moles (or gram moles) of Aluminium ion

therefore, Number of moles of Aluminium ion in " 0.0005 moles ' of Al2O3 = 0.0005 × 2

Number of mole of Aluminium ion = 0.001 mole

ANSWER :

Option (1) 0.001 moles