Chemistry Crash Course BITSAT>Chapter 1 - Mole Concept>Exercise 1>Q 71

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What weight of ${CaCO}_{3}$ must be decomposed to produce the sufficient quantity of carbon dioxide to convert $21.2 kg$ of ${Na}_{2} {CO}_{3}$ completely into ${NaHCO}_{3}$ . $[$ Atomic mass $Na = 23, Ca = 40]$
${CaCO}_{3} ⟶ CaO + {CO}_{2}$

${Na}_{2} {CO}_{3} + {CO}_{2} + H_{2} O ⟶ 2 {NaHCO}_{3}$

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Important Questions on Mole Concept

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Chemistry Crash Course BITSAT>Chapter 1 - Mole Concept>Exercise 1>Q 72

12 g

of alkaline earth metal gives

14.8 g

of its nitride. Atomic weight of metal is -

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Chemistry Crash Course BITSAT>Chapter 1 - Mole Concept>Exercise 1>Q 73

Calculate the amount of

Ni

needed in the Mond's process given below.

Ni + 4 CO ⟶ Ni (CO)_{4}

If,

CO

used in this process is obtained through a process, in which

6 g

of carbon is mixed with

44 g {CO}_{2}

.

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Chemistry Crash Course BITSAT>Chapter 1 - Mole Concept>Exercise 1>Q 74

Equal weight of

{}^{'}X^{'}

(Atomic weight

= 36

) and

{}^{'}Y^{'}

(Atomic weight

= 24

) are reacted to form the compound

X_{2} Y_{3}

. Then:

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Chemistry Crash Course BITSAT>Chapter 1 - Mole Concept>Exercise 1>Q 75

25.4 g

of iodine and

14.2 g

of chlorine are made to react completely to yield a mixture of

ICl

and

{ICl}_{3}

. Calculate the number of moles of

ICl

and

{ICl}_{3}

formed.

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Chemistry Crash Course BITSAT>Chapter 1 - Mole Concept>Exercise 1>Q 76

What weights of

P_{4} O_{6}

and

P_{4} O_{10}

will be produced by the combustion of

31 g

of

P_{4}

in

32 g

of oxygen leaving no

P_{4}

and

O_{2}

.

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Chemistry Crash Course BITSAT>Chapter 1 - Mole Concept>Exercise 1>Q 77

The number of molecules of the sweetener saccharin, which can be prepared

Question Image

from

30 C - atoms, 25 H - atoms, 12 O - atoms, 8 S - atoms and 14 N - atoms

is

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Chemistry Crash Course BITSAT>Chapter 1 - Mole Concept>Exercise 1>Q 78

The volume of

0.1 M

HCl

required to neutralise

2 g

of an equimolar mixture of

{Na}_{2} {CO}_{3}

and

{NaHCO}_{3}

completely is

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Chemistry Crash Course BITSAT>Chapter 1 - Mole Concept>Exercise 1>Q 79

At high temperature,

S_{4} N_{4}

decomposes into sulphur vapour and nitrogen. If

1 mL

of

S_{4} N_{4}

is decomposed and

2.5 mL

of mixture are obtained, the formula of sulphur vapour is: