Chemistry

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HELP!!
I'm doing an experiment to do with phosphorus and plant food and MgNH4P04 6H20
my air dry weight of MgNH4P04 6H20 was 1.31 g
grams of P in plant food was .165 g
% P in plant food is 13.87%
% P205 equivalent to % P above is 63.02%
% P 205 in 10-52-10 is 52%
i then get asked what the theoretical weight of MgNH4P04 6H20 is ???? i have no clue how to find this
thank you

  • Chemistry -

    I don't know the question. Could this be the molar mass they want? Molar mass MgNH4PO4.6H2O is 245.4.

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