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For question 6,find out how many grams of N there are in 1g of fertiliser,this would be 15/100 which is 0.15 g of nitrogen in a gram of fertiliser.So in 14 g there would be 0.15*14 =2.1 grams.http://www.xtremepapers.com/papers/...d AS Level/Chemistry (9701)/9701_s08_qp_1.pdf
please help me with question 2 and 6..
Concentration=Moles/volume.
Now find moles = mass/MR =2.1/13=0.15
then conc=0.15/5 which gives 0.03moldm^-3