Qualification > Sciences
Moles Again...
~~~~shreyapril~~~~:
I am sure abt his question as my teacher had given me this one it is not like the previous one..
Here it starts
>>>>>>>>>>>>>>>>
9.3g of impure Sodium bicarbonate[NaHCO3] was heated and 2.2g of CO2 was formed.
Calculate % purity of NAHCO3
pls hepl!!!
astarmathsandphysics:
--- Quote from: shreyapril on September 10, 2009, 02:16:59 pm ---I am sure abt his question as my teacher had given me this one it is not like the previous one..
Here it starts
>>>>>>>>>>>>>>>>
9.3g of impure Sodium bicarbonate[NaHCO3] was heated and 2.2g of CO2 was formed.
Calculate % purity of NAHCO3
pls hepl!!!
--- End quote ---
molar mass or CO2 is 12+2*16=44 so 2.2/44=0.05 moles of CO2 so .05 moles of NAHCO3. 1 mol of NaHCO3 weighs 23+1+60=84 and 0.5 moles weighs 0.05*84=4.2g
Purity =4.2/9.3=4.5=45%
~~~~shreyapril~~~~:
oops sorry
i typed the question wrong again..
it is 2.24g not 2.2
sry a silly mistake.
cant understand my own handwritting..
but thanx for the steps astar.
they will help me find the ans
Ghost Of Highbury:
--- Quote from: shreyapril on September 10, 2009, 02:32:01 pm ---oops sorry
i typed the question wrong again..
it is 2.24g not 2.2
sry a silly mistake.
cant understand my own handwritting..
but thanx for the steps astar.
they will help me find the ans
--- End quote ---
doesnt change the answer much
46%
~~~~shreyapril~~~~:
i got some wierd ans wen i tried it the way a star told me
i got something near to 98.28% purity
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