RRB Group D 27-Sep-2018 Shift 1 Solved Paper

Question : 6 of 100

Marks: +1, -0

What is the percentage of oxygen in

{Al}_{2}({SO}_{4})_{3} ?

Solution:

The percentage of Oxygen in

{Al}_{2}({SO}_{4})_{3} \......

The molar mass of Aluminium Sulfate

=2 \×27+3 \×32+4 \×16

=342 \ {gm} \/ {mole}

The mass contributed by Oxygen

=4 \× 3 \×16=192 \ {gm}

\%

contribution of oxygen

=

mass of oxygen

\×100 / {\mass \of \aluminium \sulfate}

=192 / 342 \×100=56.14 \%

Go to Question:

Prev Question

Next Question