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18 June, 18:30

Assume the atmospheric pressure is 1 atm but the actual pressure is higher than 1 atm how will this error affect the calculated molar mass of the unknown

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  1. 18 June, 18:57
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    Answer : When we consider the atmospheric pressure as 1 atm then according to the ideal gas equation we can find out the molar mass of any unknown by this formula;

    PV=nRT

    so if the pressure increases than 1 atm then we can see from the above equation that it will result in greater value for the number of moles (n) in the above equation.

    While n = m/M where m is mass of the unknown in g and M is molecular mass.

    So, if pressure is higher then it will result in molar mass of unknown which is much smaller.
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