Asked by Diana
What mass of water (in grams) is needed to dissolve 28.7 g of ammonium nitrate NH4NO3 in order to prepare a 0.452 m (molal) solution?
Answers
Answered by
Dr Russ
Molal is the number of moles per kg of solvent (not solution).
or molal = moles/(kg of water)
thus mass needed (in kg) =
(moles NH4NO3)/0.452
calculate (moles NH4NO3) from the data in the question then use the expression above to find the kg of water needed. Hence convert kg to g as asked for in the question.
or molal = moles/(kg of water)
thus mass needed (in kg) =
(moles NH4NO3)/0.452
calculate (moles NH4NO3) from the data in the question then use the expression above to find the kg of water needed. Hence convert kg to g as asked for in the question.
Answered by
Kate
793.4 g
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