If a piece of iron gains $10 %$ of its weight due to partial rushing into $F e_{2} O_{3}$ the percentage of total iron that has rusted is:

23

No worries! We‘ve got your back. Try BYJU‘S free classes today!

13

No worries! We‘ve got your back. Try BYJU‘S free classes today!

23.3

No worries! We‘ve got your back. Try BYJU‘S free classes today!

90

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Open in App

Solution

The correct option is D $90$
Let mass of piece of iron be $m$ gram
After resulting, iron obtains= $m \times \frac{10}{100} = 0.1 m$
Number of moles before rusting= $\frac{m}{56} g$
Number of moles obtained after rusting= $\frac{0.1 m}{56}$
So, amount of mole iron that has rusted is
$\frac{m}{56} - \frac{0.1 m}{56} = \frac{0.9 m}{56}$
% of iron that has rusted= $\frac{\frac{0.9 m}{56}}{\frac{m}{56}} \times 100 = 90$ %

Suggest Corrections

Similar questions

Q. If a piece of iron gains 10% of its weight due to partial rusting into

F e_{2} O_{3}

, the percentage of total iron that has rusted is:

A piece of iron has density 7.8/

c m^{3}

& volume

10^{- 4} m^{3}

. It is totally immersed in the water calculate weight of iron in water

A piece of iron has a weight of 3.5 N when it is in air and 2.0 N when it is submerged into water. What is the buoyant force on the piece of iron?

Q. (1)

If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
(a) Do you think rust is different from iron?

(2)

If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.

(b) Can you change rust back into iron by some simple method?

(3)

If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.

(4)

If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.

(d) Give two other examples of a similar type of change.

If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.

(a) Do you think rust is different from iron?

(b) Can you change rust back into iron by some simple method?

(c) Do you think the formation of rust on iron is a chemical change?

(d) Give two other examples of a similar type of change.

Join BYJU'S Learning Program

If a piece of iron gains 10% of its weight due to partial rushing into Fe2O3 the percentage of total iron that has rusted is:

The correct option is D 90Let mass of piece of iron be m gramAfter resulting, iron obtains= m×10100=0.1mNumber of moles before rusting= m56gNumber of moles obtained after rusting= 0.1m56So, amount of mole iron that has rusted ism56−0.1m56=0.9m56% of iron that has rusted= 0.9m56m56×100=90 %

If a piece of iron gains $10 %$ of its weight due to partial rushing into $F e_{2} O_{3}$ the percentage of total iron that has rusted is: