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Haloalkanes and Haloarenes
Calculate the molecular mass of the following: (i) H2O (ii) CO2 (ii...

Arrange each set of compounds in order o | Class 12 Chemistry Chapter Haloalkanes and Haloarenes, Haloalkanes and Haloarenes NCERT Solutions

Question:

Calculate the molecular mass of the following:
(i) H₂O
(ii) CO₂
(iii) CH₄

Answer:

Molecules are made up of atoms & are quite small, therefore the actual mass of a molecule cannot be detrmined.It is expressed as the relative mass.C-12 isotope is used to express the relative molecular masses of substances.Thus molecular mass of a substance may be defined as: the average relative mass of its molecule as compared to the mass of carbon atom taken as 12 amu.

(i) H₂O:

The molecular mass of water, H₂O

= (2 × Atomic mass of hydrogen) + (1 × Atomic mass of oxygen)

= [2(1.0084) + 1(16.00 u)]

= 2.016 u + 16.00 u

= 18.016

= 18.02 u

(ii) CO₂:

The molecular mass of carbon dioxide, CO₂

= (1 × Atomic mass of carbon) + (2 × Atomic mass of oxygen)

= [1(12.011 u) + 2 (16.00 u)]

= 12.011 u + 32.00 u

= 44.01 u

(iii) CH₄:

The molecular mass of methane, CH₄

= (1 × Atomic mass of carbon) + (4 × Atomic mass of hydrogen)

= [1(12.011 u) + 4 (1.008 u)]

= 12.011 u + 4.032 u

= 16.043 u

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Comments

Anupma
2019-11-09 16:32:33

Thank u for the helpâºï¸

Vinay
2019-07-19 19:33:39

Thanks its useful

Revathi
2019-04-14 16:14:57

It is helpful for me

Rohan maske
2019-04-10 07:25:10

Helpful that is..

shahin gauri
2019-03-21 16:50:55

thanks a lot

noori
2019-02-22 21:19:42

Questions 5 is missing plz upload

Lenin
2018-07-08 08:59:47

Thanks a lot just give the region and there boiling points

Kavya
2018-06-29 10:36:09

S in bromoform increase in the branching decreases the boiling pt

suraj
2018-05-01 13:02:00

thanks

Shruti
2018-02-20 14:17:02

Please arrange the boiling point order of 1chloropentane ,2chloropentane ,3chloropentane

Comment(s) on this Question

Welcome to the NCERT Solutions for Class 12 Chemistry - Chapter . This page offers a step-by-step solution to the specific question from Excercise 1 , Question 6: Arrange each set of compounds in order of increasing boiling points. (i) Bromomethane, Bromoform,....

Arrange each set of compounds in order o | Class 12 Chemistry Chapter Haloalkanes and Haloarenes, Haloalkanes and Haloarenes NCERT Solutions

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