Although both CO2 and H2O are triatomic | Class 11 Chemistry Chapter Chemical Bonding and Molecular Structure, Chemical Bonding and Molecular Structure 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

sasi
2019-10-12 11:49:51

ninte thantha

Soumya Srivastava
2019-03-10 23:39:20

Thank you

Soumya
2019-02-27 12:40:24

sana
2019-02-15 19:28:48

Thank you so much

Ashutosh Kumar
2019-02-15 11:38:29

Thank you so much

Lalit
2018-11-02 20:11:52

Very very nice explainatio are given

Amar Bajpai
2018-08-15 21:03:31

Help full

Yuvraj
2018-07-28 05:41:53

Nice and helpful

sana
2017-10-01 14:02:18

thanks i got my doubt cleared your website is really good

Team saralstudy
2017-09-29 13:51:01

Hi Sana, We are not getting your point but still you can ask your query through the same comment box or you can mail us too. Team saralstudy

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Welcome to the NCERT Solutions for Class 11 Chemistry - Chapter . This page offers a step-by-step solution to the specific question from Excercise 1 , Question 15: Although both CO2 and H2O are triatomic molecules, the shape of H2O molecule is bent while that of C....

Although both CO2 and H2O are triatomic | Class 11 Chemistry Chapter Chemical Bonding and Molecular Structure, Chemical Bonding and Molecular Structure NCERT Solutions

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