Moles Flashcards
(37 cards)
What is relative atomic mass ?
the weighted mean mass of an atom compared with 1/12 of the mass of carbon-12
What is relative isotopic mass ?
the mass of an isotope compared to 1/12 of the mass of carbon-12
What is the equation for number of atoms ?
no of atoms = no of moles x Avogadro’s constant
no of atoms = n x Na
What is Avogadro’s constant ?
6.02 x 10^23
What is the equation for number of moles ?
no of moles = mass / Molar mass
n = m / Mr
What is the empirical formula ?
the simplest whole-number ratio of atoms of each element present in a compound
What is a molecule ?
a small group of atoms held together by covalent bonds
What is the molecular formula ?
the actual number of atoms of each element in a molecule
What is molar volume ?
the volume per mole of a gas
What are the conditions at room temperature and pressure ?
20 degrees celsius ( 293K )
101 kPa
What are the two equations for calculating gas volumes at RTP ?
n = volume (dm^3) / 24
n = volume (cm^3) / 24000
How do you convert from cm^3 to dm^3 ?
times by 10^-3
How do you convert dm^3 to cm^3 ?
times by 10^3
How do you convert from cm^3 to m^3 ?
times by 10^-6
How do you convert from m^3 to cm^3 ?
times by 10^6
How do you convert from dm^3 to m^3 ?
times by 10^-3
How do you convert from m^3 to dm^3 ?
times by 10^3
What is the equation for moles of a solution ?
no of moles = concentration (moldm^-3) x volume (dm^3)
n = c x v
What is the ideal gas equation ?
pressure (Pa) x volume (m^3) = n x 8.314 x temperature (K)
PV = nRT
How do you convert from degrees celsius to kelvin ?
add 273
How do you convert from kelvin to degrees celsius ?
subtract 273
How do you convert from kPa to Pa ?
times by 10^3
How do you convert from Pa to kPa ?
times by 10^-3
What is a standard solution ?
a solution of a known concentration
