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calculate the mass percentage of each element in aluminum oxide.Then calculate themass of aluminum in a 3.62 gram sample of of aluminum

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1. The mass percentage of each element in aluminum oxide Al₂O₃ are:

i. The mass percent of Al in Al₂O₃ is 52.9%

ii. The mass percent of O in Al₂O₃ is 47.1%

2. The mass of Al in 3.62 g of Al₂O₃ is 1.73 g

1i. Determination of the percentage of Al

  • Molar mass of Al₂O₃ = (2×27) + (3×16) = 102 g/mol
  • Mass of Al of Al₂O₃ = 2 × 27 = 54 g
  • Percentage of Al =?

Percentage = mass / mass of sample × 100

Percentage of Al = (54 / 102) × 100

Percentage of Al = 52.9%

1ii. Determination of the percentage of O

  • Molar mass of Al₂O₃ = 102 g/mol
  • Mass of O of Al₂O₃ = 3 × 16 = 48 g
  • Percentage of O =?

Percentage = mass / mass of sample × 100

Percentage of O = (48 / 102) × 100

Percentage of O = 47.1%

2. Determination of the mass of Al in 3.62 g of Al₂O₃.

102 g of Al₂O₃ contains 54 g of Al.

Therefore,

3.62 g of Al₂O₃ will contain = (3.62 × 54) / 102 = 1.73 g of Al.

Thus, 1.73 g of Al is present in 3.62 g of Al₂O₃.

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