If you have worked out the number of moles of ammonia in a sample then you can calculate its mass (moles x RMM)
If you know the total mass of the solution then mass of water = mass of solution - mass of ammonia
If you know the mass of water you can calculate the volume of water from a density conversion table for the given temperature (it will be approximately 1g = 1cm3
You then have the required info to do the w/v calculation...
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