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Q.

The molar mass of the Sodium sulphate in 10 moles is


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a

1180 g 

b

1240 g

c

1260 g

d

1220 g

answer is A.

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Detailed Solution

detailed_solution_thumbnail
The molar mass of the Sodium sulphate in 10 moles is 1260 g.
One mole is defined as the amount of a substance that contains exactly 6.022×1023 elementary entities of the given substance.
Mass of Sodium sulphate in mole = molecular mass of Sodium sulphate Na2SO4
⇒     mass of 2 Na + mass of Sulphur + mass 3 Oxygen
⇒    2×23 + 32 + 3×16  = 126 g
Therefore the mass of Na2SO4 =10×126
                                                    =1260 g.
 
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