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# Chemistry watch

1. ok i just need some help on what to do, cause im not sure if i need to find the moles for the question. The question is below btw

2.287 grams of NiSO4. xH2O was heated and 1.344 grams of solid was produced. Find x.
Ni = 58.7 S = 32.1 O =16.0 H = 1
2. Sorry you've not had any responses about this. Are you sure you've posted in the right place? Here's a link to our subject forum which should help get you more responses if you post there.

Just quoting in Fox Corner so she can move the thread if needed
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3. Are you struggling with how to work out the actual moles? If that's the case n(moles) = mass(in grams)/Mr (relative molecular mass).
To solve this question, subtract the mass of solid after heating from the original mass - this will give you the mass of water which has evaporated. Then divide that mass by 18 to get the moles of water (18 because that's the Mr of water). Then divide the mass of the solid after heating by the Mr of nickel sulfate (do this one yourself) to get moles of nickel sulfate.
The ratio of nickel sulfate:water will tell you the value of x

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Updated: September 16, 2016
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