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is the answer 13.1??Asalamualaikum!
I need help for qu 2 in novemeber 2003 paper 1
A garden fertiliser is said to have a phosphorous content of 30.0% 'P2O5 is soluble in water'
What is the percentage by mass of phosphorous in the fertiliser?
A. 6.55%
B. 13.1%
C. 26.2%
D. 30.0%
look first find out the percentage of P in P2O5
it is 62/142 *100 = 43.66%
now find out 43.66% of 30 and u will get 13.1 which is the amount of P content in 30%