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b)M=3Pb+2P+8 O=3*207+2*31+8*16=811U
c)M=2C+6H+0=2*12+6*1+16=46u
d)M=4C+8H+2 0=4*12+8*1+2*16=48+8+32=88U
e)M=2Al+3S+12 O=2*27+3*32+12*16=54+96+192=342u