Answer to Question #188102 in General Chemistry for Maitha

Question #188102

Determine the number of particle , number of moles and mass , show the law of conservation of mass is observed

4Al + 3O2   →    2Al2O3

(molar mass of  O = 16 g/mol   Al= 27g/mol)



1
Expert's answer
2021-05-03T07:24:57-0400

Number of particles

Two formulae units Al2​O3​ form 4 atoms of Al and 3 molecules of O2​ Number of moles, and mass

From the law of conservation of mass;

"4Al+3O_2\\to2Al_2O_3"

"4molesAl" "{({27.0Al\\over 1molAl}) }" "=108gAl"

"3mol O_2" "({32.0gO_2\\over 1mol O_2})" "=96.0gO_2"

"Reactants_{Total Mass}" ="108g+96g=204.0g"

"\\therefore" "204.0g Al_2O_3" are produced

"2moles" "Al_2O_3" "({102gAl_2O_3\\over 1mole Al_2O_3})" "=204.0g Al_2O_3"

Law of conservation of mass

"204.0g Reactants=204.0g Products"

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