C4 - Chemical Calculations Flashcards
1
Q
How are measuring of atoms compared?
A
- Measuring them relative to carbon-12.
2
Q
Relative Formula Masses of a compound.
A
RFM 1 + RFM 2 = COMPOUND
Sulphuric Acid H2S1O4
(1 X 2) + 32 + (16 X 4)
2 + 32 + 64 = 98
3
Q
Number of moles.
A
Mass / Relative Atomic Mass - Singular.
Mass / Relative Formula Mass - Compound.
4
Q
What is the Avogadro constant number?
A
6.02 X 10^23 per mole.
5
Q
How to work out concentration.
A
(g/dm^3) = amount of solute (g) / volume of solution (dm^3)
6
Q
How to work out concentration if solution is in Cm^3.
A
(g/dm^3) = amount of solute (g) / volume of solution (cm^3) X 1000.
7
Q
Calculation of mass of solute in a certain volume of solution of a known concentration.
A
- Calculate the mass (g) of the solute there is in 1dm^3 (1000cm^3) of solution.
- Calculate the mass (g) of solute in 1cm^3 of solution.
- Calculate the mass (g) of solute there is in the given volume of solution.
8
Q
Features of a more concentrated solution.
A
- A more concentrated solution has more solute than a less concentrated solution.
