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Heating 3.210g of hydrated magnesium sulfate, MgSO4.XH2O, forms 1.567g of anhydrous magnesium sulfate. Find the value of X and write the formula of the hydrated salt

We need to find the value of X (the water of crystallisation) and to do this we can start by calculating the moles of water lost and the moles of the anhydrous salt (the salt product without water), we do th...
SR
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Calcium nitride contains 81.1% by mass of the metal. Calculate the empirical formula of calcium nitride. Show your working.

Ca NPercentage: 81.1% 18.9%Relative atomic mass: 40.1 14Ratio: (81.1/40.1) (18.9/14) 2.02 : 1.35 1.5:1 3:2Empirical formula: Ca 3 N 2
LC
Answered by Laura C. • Chemistry tutor
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Why does the nucleophilic addition of a cyanide ion to an aldehyde form a racemic mixture?

Because the plane of the C=O bond in an aldehyde is flat, and so the nucleophilic attack of CN - onto the C can occur above or below the plane of the molecule, producing two different stereoisomers of a 2-hy...
SA
Answered by Success A. • Chemistry tutor
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How do acid buffer solutions work?

Firstly, we have to understand what a buffer is. A buffer is a solution which resists changes in pH when small amounts of acid or base are added. The key word here is small amounts, as if too much acid or ba...
TD
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How can you deduce the order of the reaction with respect to the reagent based on the graph of its concentration against time?

For the zeroth order reaction, the graph would be a straight line with a negative gradient. For the first order reaction, the graph would be a curve with constant half-life. That means the time for the conce...
JU
Answered by Joanna U. • Chemistry tutor
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