Chemical Forums

Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: Tommy on May 06, 2004, 05:36:01 PM

Title: mole-to-mole conversion
Post by: Tommy on May 06, 2004, 05:36:01 PM

I'm working on a lab for a online chem class. What i'm having trouble with is conversions.  The first part is #of moles of NaCHO3 in 1.21 my work shows it to be .014mol NaCHO3.  The second part is calculate # of moles of CO2 that could be produced from the # of moles of NaCHO3 using mol-to-mole.   Can you explain this to me please.

Title: Re:mole-to-mole conversion
Post by: Mitch on May 06, 2004, 06:54:15 PM

No matter what your doing tou always have to start by writing the chemical equation. Do you happen to know what it is for this case?

Title: Re:mole-to-mole conversion
Post by: hmx9123 on May 06, 2004, 11:08:48 PM

Although you do need to start by writing out a chemical equation, if you have 1 mol of sodium bicarbonate, you can only get 1 mol of CO₂ from it maximum.  So, for every mol you have of sodium bicarbonate you have, you'll get 1 mol of carbon dioxide.  Unless you're doing something really funky, it should remain 1:1.

Title: Re:mole-to-mole conversion
Post by: Mitch on May 07, 2004, 12:51:11 AM

Are you sure its not for every 2 mols of NaHCO3 you'll get 1 mol of CO2

2 NaHCO3(s) ------->   CO2(g) + H2O(g) + Na2CO3(s)

Y. Otsubo, K. Yamaguchi, J. Chem. Soc. Japan, 82, 557-560 (1961)

Title: Re:mole-to-mole conversion
Post by: AWK on May 07, 2004, 01:27:18 AM

2 NaHCO3(s) ------->  CO2(g) + H2O(g) + Na2CO3(s)

Y. Otsubo, K. Yamaguchi, J. Chem. Soc. Japan, 82, 557-560 (1961)
This reaction is known alt least 200 years. In 1861 it was used in fomous Solvay process.
See: http://pubs.acs.org/subscribe/journals/tcaw/11/i02/html/02chemchron.html