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How do you calculate the molecular weight of an unknown salt given the concentration and known...

How do you calculate the molecular weight of an unknown salt given the concentration and known mass?

Unknown starting mass: 0.0484g
Unknown concentration: 0.00552 mM

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Answer #1

Unknown concentration: 0.00552 mM   = 0.00552*10^-3M

let volume of solution is 1 liter

no of moles    = molarity * volume of solution in L

                      = 0.00552*10^-3 *1   = 0.00552*10^-3 moles

molar mass of unknown salt = mass of salt/no of moles

                                                  = 0.0484/0.00552*10^-3   = 8768.11g/mole

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