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mSO2=32u+2*16u=64u
mH2SO3=2*1u+32u+3*16u=82u
mCl2=2*35,5u=71u
mBa(OH)2=137u+2*16u+2*1u=171u
mNa2CO3=2*23u+12u+3*16u=106u
mPb3(PO4)2=3*207u+2*31u+8*16u=811u
mC2H5OH=2*12u+6*1u+16u=46u
mC3H7COOH=4*12u+8*1u+2*16u=88u
mAl2(SO4)3=2*27u+3*32u+12*16u=342u
2)
H2O < O2 < NaOH < CO2 < NO2 < HNO3 < H2SO3