3.1.2 Amount of Substance Flashcards
3.1.2.1 Relative atomic mass and relative molecular mass 3.1.2.2 The mole and the Avogadro Constant 3.1.2.3 The ideal gas equation 3.1.2.4 Empirical and molecular formula 3.1.2.5 Balanced equations and associated calculations
What is the relative atomic mass (Ar)?
Relative atomic mass (Ar) is the average mass of one atom compared to one twelfth of the mass of one atom of Carbon-12
What is relative molecular mass (Mr)?
Relative molecular mass (Mr) is the average mass of a molecule compared to one twelfth of the mass of one atom of Carbon-12
What is a mole?
A mole is the amount of substance in grams that has the same number of particles as there are atoms in 12 grams of Carbon-12
How do you work out the number of moles for pure solids and gases?
Moles = mass/Mr
How do you work out the number of moles for gases?
PV = nRT
How do you work out the number of moles for solution?
Moles = C*V/1000
How do you convert from degrees Centigrade to Kelvin?
Kelvin = centigrade + 273
What is R - gas constant?
Gas constant = 8.31
How do you convert from cm3 to m3?
cm3 * 10^-6 = m3
How do you convert from m3 to cm3?
m3/10^-6 = cm3
How do you convert from cm3 to dm3?
cm3/1000 = dm3
How do you convert from dm3 to cm3?
dm3 * 1000 = cm3
How do you convert from cm3 to m3?
cm3/1000,000 = m3
How do you convert from m3 to cm3?
m3 * 1000,000 = cm3
How do you convert from dm3 to m3?
dm3/1000 = m3
How do you convert from dm3 to m3?
dm3/1000 = m3
How do you convert from m3 to dm3?
m3*1000 = dm3
What is apparatus uncertainty?
apparatus uncertainty = error value/measurement * 100
What is the empirical formula?
An empirical formula is the simplest ratio of atoms of each element in the compound
What is the ideal gas equation?
pV = nRT
What does p stand for in the ideal gas equation and what are the units for it?
p = pressure (Pa)
What does V stand for in the ideal gas equation and what are the units of?
V = volume of gas (m3)
What does n stand for in the ideal gas equation?
n = number of moles
What does R stand for in the ideal gas equation and what is it’s value?
R = gas constant (8.31)
What does T stand for in the ideal gas equation and what are the units for it?
T = temperature (K)
What is the molecular formula?
The molecular formula is the actual number of atoms of each element in a compound
What is the total apparatus of an experiment?
Total apparatus uncertainty = Sum of all equipment apparatus uncertainty
How do you reduce apparatus uncertainty?
- Take a bigger measurement
Why is there a theoretical yield?
- Theoretical yield tales into account complete reaction, all of substance reacting. In reality, not all of substance reacts
