At what relative humidity will $N a_{2} H P O_{4} .7 H_{2} O (s)$ deliquescent when exposed to the air at $27^{0} C$ ?

below

75 %

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above

7.0 %

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equal to

7.5 %

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above

7.5 %

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N a_{2} S O_{4}

0^{\circ}

0^{\circ} C

N a_{2} H P O_{4} . 12 H_{2} O (s) ⇌ N a_{2} H P O_{4} . 7 H_{2} O (s) + 5 H_{2} O (g); K_{p} = 2.43 \times 10^{- 13}

0^{\circ} C

4.56 t o r r

N a_{2} H P O_{4} .12 H_{2} O (s)

0^{\circ} C

N a_{2} S O_{4} \cdot 10 H_{2} O

0^{\circ} C

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At what relative humidity will Na2HPO4.7H2O(s) deliquescent when exposed to the air at 270C ?