3.90 gram of a mixture of Al and Al2O3, when reacted with a
solution of NaOH produced 840 ml of gas at STP. Find composition
of mixture.
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17
The reactions that are involved are:
2Al(s)+2NaOH+6H2O→2Na++2[Al(OH)4]−+3H2(g)
2 moles 3 moles gas
Al2O3+2NaOH+3H2O→2Na++2[Al(OH)4]−
So, mass of Al in the sample =3×22400(2×27×840)=0.675 g
So, % of Al =0.675×3.9100=17.3
Therefore. the nearest integer value is 17.
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