26.8 gm N a 2 S O 4 . n H 2 O contains 12.6 of water here the value of 'n' is?

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26.8 gm

N a_{2} S O_{4} . n H_{2} O

contains 12.6 of water here the value of 'n' is?

ChemistrySome Basic Concepts of ChemistryJEE Main

Solution:

2935 Upvotes Verified Answer

The correct answer is: 7

N a_{2} S O_{4} . n H_{2} O

Molar mass of this salt

= (142 + 18 n)

Mass of water

= \frac{12.6}{26.8} \times (142 + 18 n)

18 n = \frac{12.6}{26.8} (142 + 18 n)

On solving

n = 7

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