chem atomic mass

define relative atomic mass?

the weighted mean mass of an atom of an element compared to 1/12 of the mass of an atom of carbon-12

define relative isotopic mass?

the mass of an atom of an isotope compared with 1/12 of the mass of an atom of carbon-12

define relative formula mass?

the average mass of a molecule or formula unit compared to 1/12 of the mass of an atom of carbon -12

when is relative molecular mass used?

when reffering to molecules

when is relative formula mass used?

for compounds that are ionic or giant covalent

what is a mass spectrometer used for?

devices which are used to find out what samples are made up of by measuring the mass of their components

state avagadros constant?

6.02 times 10 to the power of 22

define molar gas volume?

the space that 1 mole of a gas occupies at a certain temperature and pressure

what is the value of room temperature?

298 k, 25 degrees c

what is the value for pressure?

101.3 kPa

what is the value for both rtp and pressure?

24 sm3 mol-1

state the ideal gas equation?

pV= nRT

• p= pressure (Pa)

• V= volume (m3)

• n= number of moles

• R= 8.314 j k-1 mol-1

• T= temperature (k)

how to convert from degrees c to kelvin?

• +273