Mr(Al(OH)3) = 78
W(Al) = Ar(Al) *n / Mr(Al(OH)3) *100% = 27*1 / 78 *100% =35%
W(O) = Ar(O) *n / Mr(Al(OH)3) *100% = 16*3 / 78 *100% =61%
W(H) = Ar(H) *n / Mr(Al(OH)3) *100% = 1*3 / 78 *100% =4%
Mr(H2SiO3) = 78
W(H) = Ar(H) *n / Mr(H2SiO3)*100% = 1*2 / 78 *100% = 3%
W(Si) = Ar(Si) *n / Mr(H2SiO3) *100% = 28 *1 / 78 *100% =36%
W(O) = Ar(O) *n / Mr(H2SiO3) *100% = 16*3 / 78 *100% =61%
Mr(Cu2O) = 144
W(Cu) = Ar(Cu) *n / Mr(Cu2O) *100% = 64*2 / 144 *100% =89%
W(O) = Ar(O) *n / Mr(Cu2O) *100% = 16*1 / 144 *100% = 11%
Mr(Fe(NO3)2) = 180
W(Fe) = Ar(Fe) *n / Mr(Fe(NO3)2) *100% = 56*1 / 180 *100% =31%
W(N) = Ar(N) *n / Mr(Fe(NO3)2) *100% = 14*2/ 180 *100% =16%
W(O) = Ar(O) *n / Mr(Fe(NO3)2) *100% = 16*6 / 180 *100% =53%
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Answers & Comments
Mr(Al(OH)3) = 78
W(Al) = Ar(Al) *n / Mr(Al(OH)3) *100% = 27*1 / 78 *100% =35%
W(O) = Ar(O) *n / Mr(Al(OH)3) *100% = 16*3 / 78 *100% =61%
W(H) = Ar(H) *n / Mr(Al(OH)3) *100% = 1*3 / 78 *100% =4%
Mr(H2SiO3) = 78
W(H) = Ar(H) *n / Mr(H2SiO3)*100% = 1*2 / 78 *100% = 3%
W(Si) = Ar(Si) *n / Mr(H2SiO3) *100% = 28 *1 / 78 *100% =36%
W(O) = Ar(O) *n / Mr(H2SiO3) *100% = 16*3 / 78 *100% =61%
Mr(Cu2O) = 144
W(Cu) = Ar(Cu) *n / Mr(Cu2O) *100% = 64*2 / 144 *100% =89%
W(O) = Ar(O) *n / Mr(Cu2O) *100% = 16*1 / 144 *100% = 11%
Mr(Fe(NO3)2) = 180
W(Fe) = Ar(Fe) *n / Mr(Fe(NO3)2) *100% = 56*1 / 180 *100% =31%
W(N) = Ar(N) *n / Mr(Fe(NO3)2) *100% = 14*2/ 180 *100% =16%
W(O) = Ar(O) *n / Mr(Fe(NO3)2) *100% = 16*6 / 180 *100% =53%