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mAg=108u
mN=14u
mO=16u
AgNO₃→108u+14u+16u×3=170u
a)0,2 mola na 1 dm³
0,25 mola na x dm³
0,2x=0,25×1
x=0,25/0,2=1,25dm³
b)17g/170g=1/10 mola
0,2 - 1 dm³
0,1 - x
x=0,1×1÷0,2=0,5dm³