Calculating Masses in Reactions Flashcards
(7 cards)
1
Q
how to calculate the amount of product formed from a mass of a reactant
A
- write out the balanced chemical equation
- worked out the RFM of the reactant and the product used in the question
- find out how many moles there are of the substance you know the mass of
- use the balanced equation to work out how many moles there will be of the other substance
- use the number of moles to calculate the mass
2
Q
what is the yield of a reaction?
A
the mass of the product
3
Q
the more reactant you start with, the…
A
higher the yield
4
Q
what is the equation for percentage yield?
A
percentage yield = actual yield (grams)/theoretical yield (grams) x100
5
Q
percentage yield is always somewhere between…
A
0-100%
6
Q
what does a 100% yield mean?
A
you got all the product you expected to
7
Q
what does a 0% yield mean?
A
no reactants were converted into product - no product at all was made
