Chemical Calculations With Moles

Cards (16)

What is the yield of a reaction?
Mass of product obtained from the reaction
What is the theoretical yield of a reaction?  
Maximum mass of the product that could have been produced
Why is the actual yield always less than the theoretical yield?
Reaction may be reversible
Some of the product can be lost on separation
Unexpected side reactions between reactant
What is percentage yield?
Actual yield as a proportion of theoretical yield
How is percentage yield calculated?
(Actual yield ÷ Theoretical yield) x 100
What is atom economy?
Measure of how many atoms of the reactants end up as useful products
Why is a high atom economy desirable?
Results in less waste/is more sustainable
How is percentage atom economy calculated?
(Mr of useful product ÷ Mr of all product) x 100
How can concentration in mol/dm3 be calculated
Moles of solute ÷ Volume
What is titration?  
Method used to calculate the concentration of an unknown solution
What is the end-point?
The point at which the reaction is complete (when the indicator changes color) and no substance is in excess
How should solution be added from the burette close to the end point?
Drop by drop, swirling in between
Why is a white tile used in titration?
To see the colour change better
What is a titre?
Volume of solution added from the burette
What are concordant titres?
Titres within 0.1cm3 of each other
What volume does one mole of any gas occupy at room temperature and pressure?
24dm^3 or 24000cm^3