Объяснение:
Mr(CH4)=12 + 4•1=16
Mr(NaOH)= 23+16+1=40
Mr(H2SO4)=2•1+32+4•16=98
Mr(K2SO3)=2•39+32+3•16=158
Mr(MgCl2)=24+2•35.5=85
Mr(Al(OH)3)=27+(16+1)•3=78
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Объяснение:
Mr(CH4)=12 + 4•1=16
Mr(NaOH)= 23+16+1=40
Mr(H2SO4)=2•1+32+4•16=98
Mr(K2SO3)=2•39+32+3•16=158
Mr(MgCl2)=24+2•35.5=85
Mr(Al(OH)3)=27+(16+1)•3=78