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Q.

What is the relative molecular mass of sodium sulphate? (The relative atomic masses of Na, S and O are 23u, 32u and 16u respectively)

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a

140

b

132

c

142

d

144  

answer is C.

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Detailed Solution

Relative Molecular Mass of Sodium Sulphate Na2 SO4
Thus, It contains 2 molecules of Sodium, 1 molecule of Sodium and 4 molecules of Oxygen.
Total molecular mass=23×2+32+16×4=142 u
 
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What is the relative molecular mass of sodium sulphate? (The relative atomic masses of Na, S and O are 23u, 32u and 16u respectively)