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Q.

A hydrated compound $C a C r O_{4}$ . $x H_{2} O$ , on heating looses approximately 18.7 % mass. If the molecular weight of $C a C r O_{4}$ . $x H_{2} O$ is 192 what is the value of x.(Atomic mass Ca=40 amu, Cr = 52 amu)

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answer is 2.

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Detailed Solution

If M.wt of $C a C r O_{4}$ ,x $H_{2} O$ is 192. The loss of wt is approximately 36 so the water of crystallisation is 2.

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