AChapel Posted September 16, 2008 Report Share Posted September 16, 2008 How do you know what is constant in Boyles, Charles and Gay-Lussacs laws and how do you know whether to use those formulas, the ideal gas law formula or the combined gas formula? Thanks! Reply Link to post Share on other sites More sharing options...
__inthemaking Posted September 16, 2008 Report Share Posted September 16, 2008 The question should tell you what is held constant. And you decide whether or not to use a particular formula based on what you're trying to find and what you're given in each question. Reply Link to post Share on other sites More sharing options...
starry-night Posted September 20, 2008 Report Share Posted September 20, 2008 [quote name='AChapel' post='24458' date='Sep 16 2008, 10:42 AM']How do you know what is constant in Boyles, Charles and Gay-Lussacs laws and how do you know whether to use those formulas, the ideal gas law formula or the combined gas formula? Thanks![/quote] usually if there's moles involved then u have to use the ideal gas formula. the combined gas formula is just a mixture of all the laws (except Avogadro) so if you know that formula then u dont even have to noe other ones individually. Whatever variable isn't mentioned in the question, eliminate it from the combine gas formula and u are left with the equation that u need to solve the question. ex. A sample of neon has a volume of 239 cm3 at 2.00 atm of pressure. What would the pressure have to be in order for the gas to have a volume of 5.00 x 102 cm3? in this question V and P are mentioned NOT temperature so, eliminate the T1 and T2 in the combined gas formula - P1 V1 / T1 = P2 V2 / T2 Reply Link to post Share on other sites More sharing options...
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