Chemistry Formulas Flashcards
(8 cards)
1
Q
Number of moles =
A
Number of moles = mass ÷ relative formula mass
2
Q
Concentration(mol/dm^3) =
A
Concentration(mol/dm^3)
= moles of solute ÷ volume of solution (dm^3)
3
Q
Concentration(mol/dm^3) if given mass instead of moles.
A
Concentration = mass of solute(g) ÷ volume of solution(dm^3)
4
Q
Molar gas volume at RTP and 1 atm
A
1 mole of gas = 24 dm^3
Volume of gas = moles * 24
5
Q
Empirical formula calculation
A
Percent to mass, mass to moles, divide by smallest then times till whole.
6
Q
Molecular formula
A
Molecular formula = Empirical formula × Molecular mass ÷ Empirical mass
7
Q
Percentage yield =
A
Percentage yield = (actual yield ÷ theoretical yield) × 100
8
Q
(Electrolysis)
Charge (coulombs, Q) =
A
Q = I × t
