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Q.

Which of the following is the correct molecular mass of MgSO4?


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a

46u     

b

124u     

c

120u 

d

62u     

answer is D.

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Detailed Solution

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The molecular mass of MgSO4 is 120u.
Molecular mass is the sum of all the atoms in the molecule of a compound.
Here we are given to find the molecular mass of MgSO4, so we will first find the Atomic mass of all the molecules so it will be Mg=24,
⇒,S=32
⇒ O=16 ( here there are four oxygen atoms, so we will multiply by 4 )
⇒The sum of the molecules will be = 24+32+64
= 120u.
 
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