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a sample of hydrated NiSO4 witha mass of 4.414g is heated to remove all water crystallisation. The resultant mass is 2.287g. How many H2O molecules to each NiSO4 were there in the original sample

Mr of NiSO4 is 154.8 g/mol Mr of H2O is 18 Mass of NiSO4 in sample is 2.287 g Mass of H2O in sample is 4.414-2.287 = 2.127g divide mass of each of NiSO4 and H2O by Mr to obtain the ratio in moles NiSO4: 2.28...
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Answered by Calum S. • Chemistry tutor
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What do I do if I don't know the answer to the professor's question?

Don't worry, they are doing this on purpose! Oxbridge interviews aren't meant to trick you, but they are meant to test how you cope with new information and working things out on your own. The interviewer wa...
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Is there such a thing as pure, rational knowledge? Would mathematics fall into this category?

This is a classic epistemological question asking you to engage with the debate between rationalists like Descartes and empiricists like Hume. To answer this effectively we need to make clear what the opposi...
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Answered by Tom R. • Philosophy tutor
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How should I structure my essay?

The TSA essay can be very off-putting - unlike normal exams, you can't revise lots of facts and the chances are the questions are not going to match what you've been studying for A levels/IB. But Oxford prof...
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Answered by Tom R. • TSA Oxford tutor
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calculate the resistivity in a 1.2m length of cylindrical wire with radius 1cm. The resistance of the wire is 0.01 kilo Ohms

The primary equation in this calculation is rho = RA/L Where rho is resistivity, A is cross sectional area, L is length, and R is resistance The resistance and length are given in the question. Resistance ho...
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Answered by Calum S. • Physics tutor
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