Qualification > Sciences

MOLES question.

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nonelee:
i am taking coordinated science this week.
and i have a question please answer (:

theres a formula for calculating moles right?
but i forgot, please tell me.
and there are also something else related to moles.
i forgot too. so again, please answer. thanks!

idk:
Number of moles=given mass of substance divided by( / ) atomic or molecular mass of the substance.
for eg-given mass  of a piece of coal(carbon)=24g. at.mass of carbon=12
therefore number of moles=24/12=2 moles
best of luck and Take care.

Q80BOY:
finding the mole using the realative atomic mass:

mole = mass used / relative atomic mass

finding the mole of a compund:

mole = mass used / relative molecular mass

finding the mole in a solution:

mole = volume (dm^3) * molarity

finding the mole of any gas:

mole = volume (dm^3) / 24 dm^3

finding the percentage yield:

% yield = (mass produced / theoretical yield) * 100

finding the percentage purity:

% purity = (actual mass reacted / initial mass used) * 100

hope this helps  :)

nonelee:
thank you people :D
but i remember theres this formula which needed volume?
i forgot..

Q80BOY:

--- Quote from: nonelee on June 02, 2009, 10:34:43 am ---thank you people :D
but i remember theres this formula which needed volume?
i forgot..

--- End quote ---

i added it  ;)

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