4.3 Stoichiometric calculations Flashcards
1
Q
What is stoichiometry?
A
the study of mole relationships involved in chemical reactions
2
Q
What is the mass of a mole of any substance in grams equal to?
A
GFM
3
Q
How can GFM be calculated?
A
using relative atomic masses
4
Q
What is percentage by mass?
A
the mass of solute made up to 100cm^3 of solution
5
Q
What is percentage by volume?
A
the number of cm^3 off solution made up to 100cm^3 of solution
6
Q
What does the unit ppm stand for and what does it refer to?
A
- parts per million
- 1mg per kg or 1mg per L
7
Q
How is the percentage yield decreased?
A
- mass transfer or mechanical losses
- purification of product
- side reactions
- equilibrium position
