Question :

Calculate the molecular masses of the following elements

• H2
• O2
• Cl2
• CO2
• CH4
• C2H6
• C2H4
• NH3
• CH3OH

Science

Class 9

##### Views

1172

Aarohi

Emily

Molecular mass of

H2 = 2 × Atomic mass of H = 2 × 1 = 2 u
O2 = 2 × Atomic mass of O = 2 × 16 = 32 u
Cl2= 2 × Atomic mass of Cl = 2 × 35.5 = 71 u
CO2= Atomic mass of C + 2 × Atomic mass of O = 12 + 2 × 16 = 44 u
CH4= Atomic mass of C + 4 × Atomic mass of H = 12 + 4 × 1 =  16 u
C2H6= 2× Atomic mass of C + 6× Atomic mass of H= 2 × 12 + 6 × 1 = 30 u
C2H4= 2 x Atomic mass of C + 4 × Atomic mass of H = 2 × 12 + 4 × 1 = 28 u
NH3 = Atomic mass of N + 3 × Atomic mass of H = 14 + 3×1 = 17 u
CH3OH= Atomic mass of C + 3 × Atomic mass of H + Atomic mass of O + Atomic mass of H = 12 + 3×1 + 8 + 1 = 24 u

## Advantages Of NCERT, CBSE & State Boards Solutions For All Subjects

• All the NCERT Solutions have been prepared by academic experts having 10+ years of teaching experience.
• They have prepared all the solutions in simple and easy language so that each and every student can understand the concepts easily.
• All the solutions have been explained step to step-wise in details with better explanations.
• Students can also use these question and answers for your assignments and in homework help.
• All the solutions have been explained in detail and the answers have been compiled in a step-wise manner.
• All the questions and answers are commonly prepared according to the Latest Syllabus of Board Education and Guidelines.
• Students can know about the various types of questions asked in the exams with the help of these solutions.