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Is general gas law similar with combined gas law?

How to find molar weight using the combined aka general gas law?

  • This is a question I gotta do for my chem lab today and I have no idea how one would use this formula to calculate a molar mass since you can't calculate moles using this law and the weight isn't supplied to us. Please help

  • Answer:

    You cannot determine molar mass of a gasby using the combined gas equation: P1V1/T1 = P2V2/T2 This can only be done using what is called the ideal gas law equation: PV = nRT. The usual format of the question is: X g of gas occupies a volume of ? litres at ? pressure and ? temperature What is the molar mass of the gas? You solve for n, moles and from the m given mass , you calculate the mass of 1 mol. Without being critical of you , my experience is that when students somehow have a seemingly impossible task to perform , the usual problem is that they have not read the question properly. What does the question say EXACTLY - that is word for word as it appears in the question sheet or book.

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The ideal gas law PV = nRT can be re-written, substituting mass/MW for n (because the mass of something divided by its molar mass is the number of moles). So, the ideal gas law becomes PV = (mass/MW) RT, and can be rearranged to: MW = massRT/PV That help?

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