kardo135
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A nickel compound has the formula Ni(NO3)2 .xH2O and a molar mass of 290.7 g mol^-1. calculate the value of x.

help please
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miszanjz
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so you know the whole Mr is 290.7. If you work out the Mr of the Ni(NO3)2 it's 182.7. Therefore the Mr of the water in the formula must be 290.7-182.7=108. We also know that the Mr of one water molecule is 18. So how many waters must we have to have a Mr of 108? 108/18 = 6. x = 6.
i was stuck on this too but i figured it out after a while
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