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b)mK2O=2*39u+16u=94u
c)mH3PO4=3*1u+31u+4*16u=98u
d)mHNO3=1u+14u+3*16u=63u
b) K2O = 39*2 + 16 = 94u
c) H3PO4= 98u
d) HNO3=63u