An unknown hydrate of sodium dichromate, Na 2 Cr 2 O 7 XH 2 O, is

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An unknown hydrate of sodium dichromate, Na2Cr2O7 · XH2O, is heated and releases 12.1% water. What is the water of crystallization (X) for the hydrate? 

(a) 1

(b) 2

(c) 3

(d) 4

(e) 12.

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