November 19, 2010

Mole Conversions


1. 6.022 * 10^23 particles = 1 mole
a) particles to moles
Particles / (6.022*10^23) = moles
Ex. (3.01*10^24 particles) * (1mole / 6.022*10^23 particles) = 5.00 moles with significant figures
b) moles to particles
moles * 6.022*10^23 = particles
Ex. 0.75 moles * (6.022*10^23 molecules) / 1mole = 4.5 * 10^23 molecules with significant figures
c) grams to moles
mass of something * (1mole / atomic mass)
Ex. 3.45g Carbon to moles
3.45g * (1mole / 12.0g [Carbon's atomic mass]) = 0.288 moles Carbon
Ex. 6.2g of MgCl2 to moles
6.2g * (1mole / 95.3g [MgCl2 atomic mass])  = 0.0650 moles MgCl2