simple volumetric calculations Watch

jmensah_
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what isthe molarity of 85g of silver nitrate AgNO3, IN 250CM^3 of solution
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the traveller
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molarity is measured in moles per dm3 so therefore you are finding out the concentration.
the eqution for concentration is
concentration= moles/volume(dm3)
we need to find out the values of moles and volume in dm3 and then put in these values back into the equation to get your answer

volume= 0.25dm3 because 1 dm3 there is 1000cm3
moles is found by using the equation
moles=mass/Mr(molecular mass)
therefore
moles=85/170=0.5 moles

put these two values back into the equation
concentration=0.5/0.25=2 mol/dm3
therefore the molarity is 2 mol/dm3
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jmensah_
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(Original post by the traveller)
molarity is measured in moles per dm3 so therefore you are finding out the concentration.
the eqution for concentration is
concentration= moles/volume(dm3)
we need to find out the values of moles and volume in dm3 and then put in these values back into the equation to get your answer

volume= 0.25dm3 because 1 dm3 there is 1000cm3
moles is found by using the equation
moles=mass/Mr(molecular mass)
therefore
moles=85/170=0.5 moles

put these two values back into the equation
concentration=0.5/0.25=2 mol/dm3
therefore the molarity is 2 mol/dm3
thanks alot that really helped
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