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a) mH2S=2*1u+32u=34u
b) mCO=12u+16u=28u
c) mP4O10=4*31u+10*16u=284u
d) mH2SO3=2*1u+32u+3*16u=82u
e) mAl(OH)3=27u+3*16u+3*1u=78u
f) m(NH4)2CrO4=2*14u+8*1u+52u+4*16u=152u