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Q.

Calculate the molecular mass of CH3OH.


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a

29

b

30

c

32

d

28 

answer is C.

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Detailed Solution

Concept- One sample mole's weight is the molar mass. To get the molar mass, connect the atomic masses (atomic weights) of each atom in the molecule.
We can observe that the compound has one carbon atom, three hydrogen atoms, one oxygen atom, and one more hydrogen atom. Carbon has an atomic mass of 12.
For hydrogen it is 1
For oxygen it is 16.
So, now we add the atomic masses multiplied by the number of atom each element has
Now,
Molecular mass of CH3OH will be
= 1 ×   12 ×   3 ×  1 +1 ×   16 + 1 ×  1
= 12 + 3 + 16 + 1
= 32
Hence, option 3 is the correct answer.
    
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