A) m SiO2= 28u+ 16u*2= 60u
B) m Be3(PO4)2= 9u*3+ 31u*2+16u*8= 27u+62u+128u= 217u
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A) m SiO2= 28u+ 16u*2= 60u
B) m Be3(PO4)2= 9u*3+ 31u*2+16u*8= 27u+62u+128u= 217u