Amount Of Substance Flashcards
What is relative atomic mass (Ar)? (1)
Ar = average mass of an atom / 1/12th mass of 1 atom of 12C
What is relative molecular mass (Mr)? (1)
Mr = average mass of an molecule / 1/12th mass of 1 atom of 12C
What is relative formula mass (Mr)? (1)
Mr = average mass of entity / 1/12th mass of 1 atom of 12C
What is Avogadro constant? (1)
The total number of particles in a mole of substance.
What is Avogadro’s number? (1)
6.022 x 10(23)
What is concentration measured in? (1)
Mol dm(-3)
How to calculate concentration? (1)
Concentration mol dm(-3) = moles (n) / volume V dm(3)
How to calculate moles? (1)
Mass (g) / Mr
What is a mole? (1)
The amount of substance that contains 6.022 x 10(23) particles.
How many moles are in the Ar of at element? (1)
The relative atomic mass of any element in grams contains one mole of atoms.
How many moles are in the relative molecular mass of a substance? (1)
The relative molecular mass (or relative formula mass) of a substance in grams, contains one mole of entities.
What if the equation to work out the number of moles, in terms of mass of a substance? (1)
Number of moles = mass (g) / mass of 1 mole (g)
How o calculate the number off moles in a given volume of solution? (1)
Number of moles in solution = concentration mol dm(-3) x volume cm(3) / 1000.
What is Boyle’s law, in terms of the ideal gas equation? (1)
The product of pressure and volume is constant as long as the temperature remains constant. Thus pressure x volume = constant.
What is Charles law, in terms of the ideal gas equation? (1)
The volume is proportional to the temperature as long as the pressure remains constant. Thus, volume = temperature and volume / temperature= a constant.
What is Gay-Lussac’s law or the constant volume law, in terms of the ideal gas equation? (1)
The pressure is proportional to the temperature as long as the volume remains constant. Thus, pressure =temperature and pressure / temperature = constant.
What s the ideal gas equation? (1)
Pressure x volume = moles x gas constant x temperature
What is temperature measured in,in terms of the deal gas equation? (1)
K, to get this add 273 to the degree.
What is gas constant measured in? (1)
J K(-1) mol(-1)
What is volume measured in?(1)
M(3), to get this for dm(3) divide by 1000, for cm(3) divide by 1,000,000.
What is pressure measured in, in terms of the ideal gas equation? (1)
Pa, to get this, if kPa multiple by 1000, for MPa multiple by 1,000,000.
What is the empirical formula? (1)
The formula that represents the simplest whole number ratio of atoms of ah element present in a compound.
What is the molecular formula? (1)
Gives the actual number of atoms of each element in one molecule of the compound.
