67. What is the percentage of aluminum in aluminum oxide (Al2O3)?
-
What is the percentage of aluminum in aluminum oxide (Al2O3)?
A. 47%
B. 48%
C. 53%
D. 54% -
What is the weight of 2 moles of carbon dioxide (CO2)?
A. 22.0 grams
B. 44.0 grams
C. 66.0 grams
D. 88.0 grams
4 Answers
Molar mass = 102 g/mol
% Al = 2 x 27 x 100 / 102 = 53
Molar mass CO2 = 44 g/mol
2 mol x 44 g/mol = 88.0 g
molar mass of Al2O3 = 2*27+3*16= 54+48=102
the weight fraction AL is 54/102= 52.94% so answer C
1 mole of CO2 weighs 12+2*16 =44g
so 2 moles 2*44=88g
Answer D
add the masses of the 2 Al = numerator
add the masses of the 2 Al and the 3 O = denominator
multiply by 100 = the answer as a percent
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