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# chem U5

### moles/mole conversions/volume of a mole of a gas

mole when we measure we often assign names to #s; represents a non-user friendly #
1 mole = ? 12g of C-12
few= 3
millenium 1000
googol 10^100
does 1 mole of pennies=1 mole of gold? NO
does a mole of bricks weigh more or less than a mole of feathers? more than
molar mass what 1 mole of something would weigh
when do you use mole conversions when you cannot easily count individual atoms; to convert between moles, molecules, and grams
if you cannot count the atoms individually, then how do you count the atoms? by weighing individual variables
what is the t-chart for unit conversions? what you have units of what you want ------------------ x ------------------------------ 1 units of what you have
what are the conversion factors for moles, atoms/molecules, molar mass, and liters? moles=1, atoms/molecules=6.02*10^23, grams=molar mass, liters=22.4
avagadro's hypothesis when talking about gases, the amount of space that 1 mole occupies will always be the same
why can liquids and solids take up different amounts of space (each solid and liquid) each atom is differently sized and packed
how can the volume that gas takes up change? it can change dependent on heat and pressure (increase temp.=expand)
under what condition will avagadro's hypothessis work? if the heat and pressure are constant (STP)
STP standard temperature and pressure
what is the standard temperature and pressure? 1 atomsphere (atm) at 0 degrees C, and at sea level
what does the mole bridge look like now Liters | grams---mole---atoms/molecules
empirical formula the reduced formula (ionic)
molecular formula the real amount of atoms present (covalent)
4 steps to determine % composition 1) percent to mass 2)mass to mole 3) divide by small 4) multiply till whole
hydrates a solid compound that contains water molecules in its crystal form
efflorescent water is not attached well and can be lost to the air
hygroscopic water can be pulled out of the air into the compound
deliquescent absorbs so much moisture that it becomes a liquid
anhydrous when a hydrate has been dried out
how to find the formula of hydrates convert the wet and dry substance into moles, then divide by small
Created by: allyson.lee