25 g of an unknown hydrocarbon upon burning produces 88 g of C O 2 and 9 g of H 2 O . This unknown hydrocarbon contains:

24 g of carbon and 1 g of hydrogen

18 g of carbon annd 7 g of hydrogen

22 g of carbon and 3 g of hydrogen

20 g carbon and 5 g of hydrogen

In the reaction 2 Al s + 6 HCl aq → 2 Al 3 + aq + 6 Cl - aq + 3 H 2 g ,

11.2 L H 2 g at STP is produced for every mole of HCl aq consumed.

6 L HCl aq is consumed for every 3 L H 2 g produced.

33.6 L H 2 g is produced regardless of temperature and pressure for every mole of Al that reacts.

67.2 L H 2 g at STP is produced for every mole of Al that reacts.

MEDIUM

Earn 100

$5$ moles of $VO$ and $6$ moles of ${Fe}_{2} O_{3}$ are allowed to react completely according to reaction

$VO + {Fe}_{2} O_{3} ⟶ FeO + V_{2} O_{5}$

The number of moles of $V_{2} O_{5}$ formed is :

50% studentsanswered this correctly

Important Questions on Some Basic Concepts of Chemistry

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Stoichiometry and Stoichiometric Calculations

1.0 g

Mg

is burnt with

0.28 g

O_{2}

in a closed vessel. Which reactant is left in excess and how much?

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Stoichiometry and Stoichiometric Calculations

1.0 g

of magnesium is burnt with

0.56 g

O_{2}

in a closed vessel. Which reaction is left in excess and how much? (At, wt.

M g = 24; O = 16)

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Stoichiometry and Stoichiometric Calculations

0.4 g

of dihydrogen is made to react with

7.1 g

of dichlorine to form hydrogen chloride. The volume of hydrogen chloride formed at

273 K

and

1 bar

pressure is

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Stoichiometry and Stoichiometric Calculations

$N_{2 (g)} + 3 H_{2 (g)} ⇌ 2 {NH}_{3 (g)} 20 g 5 g$

Consider the above reaction, the limiting reagent of the reaction and number of moles of ${NH}_{3}$ formed respectively are

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Stoichiometry and Stoichiometric Calculations

For the following reaction, the mass of water produced from

445 g

C_{57} H_{110} O_{6}

is:

2 C_{57} H_{110} O_{6} (s) + 163 O_{2} (g) \to 114 {CO}_{2} (g) + 110 H_{2} O (l)

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Stoichiometry and Stoichiometric Calculations

$20 ml$ of acetic acid reacts with $20 ml$ of ethyl alcohol to form ethyl acetate. The density of acid and alcohol are $1 g / ml$ and $0.7 g / ml$ respectively. The limiting reagent in this reaction is

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Stoichiometry and Stoichiometric Calculations

The mass of

AgCl

precipitated when a solution containing

11.70 g

NaCl

is added to a solution containing

3.4 g

{AgNO}_{3}

is [Atomic mass of

Ag = 108

, Atomic mass of

Na = 23

]

HARD

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Stoichiometry and Stoichiometric Calculations

Production of iron in blast furnace follows the following equation

${Fe}_{3} O_{4} (s) + 4 CO (g) \to 3 Fe (l) + 4 {CO}_{2} (g)$

when $4.640 kg$ of ${Fe}_{3} O_{4}$ and $2.520 kg$ of $CO$ are allowed to react then the amount of iron (in $g$ ) produced is :

[Given: Molar Atomic mass $({gmol}^{- 1}) : Fe = 56$

Molar Atomic mass $({gmol}^{- 1}) : O = 16$

Molar Atomic mass $({gmol}^{- 1}) : C = 12$ ]

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Stoichiometry and Stoichiometric Calculations

When

22.4

litres of

H_{2} (g)

is mixed with

11.2

litres of

C l_{2} (g),

each at STP, the moles of

H C l (g)

formed is equal to

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Stoichiometry and Stoichiometric Calculations

In the following reaction:

$A + 2 B + 3 C ⇌ A B_{2} C_{3}$
$6.0 g$ of $A$ , $6.0 \times 10^{23}$ atoms of $B$ and $0.036 mol$ of $C$ reacted and formed $4.8 g$ of compound $A B_{2} C_{3}$ . If the atomic mass of $A$ and $C$ are $60$ and $80 amu$ , respectively. What is the atomic mass of $B$ in $amu$ ? (Avogadro number $= 6 \times 10^{23}$ )

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Stoichiometry and Stoichiometric Calculations

A bicycle tyre is filled with air having pressure of

270 kPa

27 ° C

. The approximate pressure of the air in the tyre when the temperature increases to

36 ° C

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Stoichiometry and Stoichiometric Calculations

The number of moles of hydrogen molecules required to produce

20

moles of ammonia through Haber’s process is:

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Stoichiometry and Stoichiometric Calculations

For a reaction,

N_{2} (g) + 3 H_{2} (g) ⟶ 2 N H_{3} (g)

, identify di-hydrogen

(H_{2})

as a limiting reagent in the following reaction mixtures.

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Stoichiometry and Stoichiometric Calculations

25 g

of an unknown hydrocarbon upon burning produces

88 g

C O_{2}

and

9 g

H_{2} O .

This unknown hydrocarbon contains:

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Stoichiometry and Stoichiometric Calculations

1

gram of a carbonate

(M_{2} {CO}_{3})

on treatment with excess

HCl

produces

0.01186

moles of

{CO}_{2}

. The molar mass of

M_{2} {CO}_{3}

{gmol}^{- 1}

is:

MEDIUM

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Stoichiometry and Stoichiometric Calculations

When 10 g of 90% pure lime stone is heated completely, the volume (in litres) of

{C O}_{2}

is liberated at STP is

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Stoichiometry and Stoichiometric Calculations

If we take

44

g of CO₂ and

14

g of N₂. What will be the mole fraction of CO₂ in the mixture?

EASY

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Stoichiometry and Stoichiometric Calculations

In the reaction

2 Al (s) + 6 HCl (aq) \to 2 {Al}^{3 +} (aq) + 6 {Cl}^{-} (aq) + 3 H_{2} (g)

HARD

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Stoichiometry and Stoichiometric Calculations

0.3780 g

of an organic chloro compound gave

0.5740 g

of silver chloride in Carius estimation. Calculate the percentage of chlorine present in the compound.

HARD

Chemistry>Physical Chemistry>Some Basic Concepts of Chemistry>Stoichiometry and Stoichiometric Calculations

19.7 kg of gold was recovered from a Smuggler. How many atoms of gold were recovered?

5 moles of VO and 6 moles of Fe2O3 are allowed to react completely according to reaction VO + Fe2O3 ⟶ FeO + V2O5 The number of moles of V2O5 formed is :

Important Questions on Some Basic Concepts of Chemistry

Learn and Prepare for any exam you want !

$5$ moles of $VO$ and $6$ moles of ${Fe}_{2} O_{3}$ are allowed to react completely according to reaction

$VO + {Fe}_{2} O_{3} ⟶ FeO + V_{2} O_{5}$

The number of moles of $V_{2} O_{5}$ formed is :