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Kelsie Sawayn

Feb 20, 2025

67. What is the percentage of aluminum in aluminum oxide (Al2O3)?

A. 47%B. 48%C. 53%D. 54% 68. What is the weight of 2moles of carbon dioxide?A. 22.0 gramsB. 44.0 gramsC. 66.0 gramsD. 88.0 grams
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4 Answers

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Madie Hilpert

Feb 20, 2025

Molar mass = 102 g/mol% Al = 2 x 27 x 100 / 102 = 53Molar mass CO2 = 44 g/mol2 mol x 44 g/mol = 88.0 g... Show More
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Madie Hilpert

Feb 20, 2025

molar mass of Al2O3 = 2*27+3*16= 54+48=102the weight fraction AL is 54/102= 52.94% so answer C1 mole of CO2 weighs 12+2*16 =44g so 2 moles 2*44=88g Answer D... Show More
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Madie Hilpert

Feb 20, 2025

add the masses of the 2 Al = numeratoradd the masses of the 2 Al and the 3 O = denominatormultiply by 100 = the answer as a percent... Show More
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M
Madie Hilpert

Feb 20, 2025

molar mass of Al2O3=102g/mol%Al=(54/102)*100%Al=53%Ans;Cn=m/Mm=nMm=2*44m=88gAns=D... Show More
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