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

HARD

Earn 100

$20 g$ of sugar is dissolved in water to make $100 g$ of solution.Determine the mass percentage of sugar.

Important Questions on Some Basic Concepts of Chemistry

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

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)

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:

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

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:

EASY

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

The mass of

C a C O_{3}

required to react with

25 m L

0.75 M H C l

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

4 A + 2 B + 3 C \to A_{4} B_{2} C_{3},

what will be the number moles of product formed, starting from one mole of

A, 0.6

moles of

B

and

0.72

moles of

C ?

EASY

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

When

32.25 g m

ethyl chloride dehydro halogenated, if gives

50 %

. Alkene, what is the mass of product. (atomic mass of chlorine

= 35.5

)

HARD

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

1 g Mg

was burnt in a closed vessel containing

2 g

oxygen. Which of the following are not correct ?

EASY

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

A person adds

1.71

gram of sugar (

C_{12} H_{22} O_{11}

) in order to sweeten his tea. The number of carbon atoms added are (molecular mass of sugar

= 342

)

EASY

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

5.6 litre of a gas at N.T.P. weights equal to 8 g. The vapour density of gas is :

HARD

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

1.2 g

M g

(at. mass

24

) will produce

M g O

equal to

HARD

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

The number of atoms present in $0.1$ mole of $P_{4}$ (atomic mass = 31) are :

HARD

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

5 moles of Ba(OH)₂ are treated with excess of CO₂. How much BaCO₃ will be formed?

HARD

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

The one which has least mass is :

EASY

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

The number of atoms in

4.25 g of {NH}_{3}

is approximately :

EASY

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

What volume of hydrogen gas, at 273 K and 1 atm. pressure will be consumed in obtaining 21.6 g of elemental boron (atomic mass = 10.8)from the reduction of boron trichloride by hydrogen ?

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

HARD

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

If 8.4 gm of cyclohexane burns completely in oxygen, how many moles of CO₂ is produced?

20g of sugar is dissolved in water to make 100g of solution.Determine the mass percentage of sugar.

Important Questions on Some Basic Concepts of Chemistry

Learn and Prepare for any exam you want !

$20 g$ of sugar is dissolved in water to make $100 g$ of solution.Determine the mass percentage of sugar.