The molar mass of the Sodium sulphate in 10 moles is

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1180 g

1240 g

1260 g

1220 g

answer is A.

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Detailed Solution

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 \times 1 0^{23}

elementary entities of the given substance.
Mass of Sodium sulphate in mole = molecular mass of Sodium sulphate

N a_{2} S O_{4}

\Rightarrow mass of 2 Na + mass of Sulphur + mass 3 Oxygen

\Rightarrow 2 \times 23 + 32 + 3 \times 16

= 126 g

Therefore the mass of

N a_{2} S O_{4} = 10 \times 126

= 1260 g

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