а) Mr(O3)=3x16=48
Mr(FeO)=56+16=72
Mr(CO)= 12+16=28
Mr(CuS) =64+32=96
Mr(FeS2)=56+2x32=56+64=120
Mr(NaOH)=23+16+1=40
Mr(ZnCl2)=65+2x35.5=65+71=136
Mr(NaBr) =23+80=103
Mr(AlP) =27+31=58
Mr(BaCl2)=137+2x35.5=137+71=208
Mr(NH3)=14+3x1=17
Mr(NO2)=14+2x16=14+32=46
Mr(NaNO3)=23+14+3x16=23+14+48=85
Mr(Ca3N2)=3x40+2x14=120+28=148
б) Mr(Al2O3)=2x27+3x16=102
Mr(CrSO4)=52+32+4x16=52+32+64=148
Mr(BaCO3)=137+12+3x16=137+12+48=197
Mr(AlPO4)=27+32+4x16=122
Mr[Cu(OH)2]=64+2(16+1)=64+34=98
Mr(Mg3N2)=3x24+2x14=100
Mr(Fe3O4)=3x56+4x16=168+64=232
Mr (CaCO3)=40+12+3x16=40+12+48=100
Mr(BaSO4)=137+32+4x16=137+32+64=233
Mr[Cr(OH)3]=52+3(16+1)=52+51=103
в)
Mr[Al(NO3)3]=27+3(14+48)=27+3x62=27+186=213
Mr [Mg3(PO4)2]=3x24+2(31+4x16)=72+2x95=72+190=262
Mr [Cr2 (SO4)3]=2x52+3(32+3х16)=104+3х96=392
Mr [(NH4)2SO4]=2(14+4)+32+4х16=36+32+64=132
Mr[Cr(NO3)2]=52+3(14+3х16)=52+124=176
Mr[(NH4)2HPO4]=2(14+4)+1+31+4х16=36+1+31+64=132
Mr [Hg(NO3)2]=200+2(14+3х16)=200+124=324
Mr[Cr2(SiO3)3]=2х52+3(28+3х16)=104+3х76=104+228=332
дано
m(ppa KOH) = 300 g
W(KOH) = 20%
m(ppa H3PO4) = 300 g
W(H3PO4)= 20%
m(K3PO4)-?
m(H2O)-?
m(KOH) = m(ppa KOH) * W(KOH) / 100% = 300 * 20% / 100% = 60 g
M(KOH) = 56 g/mol
n(KOH) = m(KOH) / M(KOH) = 60 / 56 = 1.07 mol
m(H3PO4) = m(ppa H3PO4) * W(H3PO4) / 100% = 300 * 20% / 100% = 60 g
M(H3PO4) = 98 g/mol
n(H3PO4) = m(H3PO4) / M(H3PO4) = 60 / 98 = 0.61 mol
n(KOH) > n(H3PO4)
H3PO4+3KOH-->K3PO4+3H2O
n(H3PO4) = n(K3PO4) = 0.61 mol
M(K3PO4) = 212 g/mol
m(K3PO4) = n(K3PO4) * M(K3PO4) = 0.61 * 212 = 129.32 g
n(H3PO4) = 3n(H2O)
n(H2O) = 3 * 0.61 = 1.83 mol
M(H2O) = 18 g/mol
m(H2O) = n(H2O) * M(H2O) = 1.83 * 18 = 32.94 g
ответ 129.32 г , 32.94 г
