1)6Zn(NO3)2+2Li3PO4=Zn3(PO4)2+6LiNO3
2)AlF3+K3PO4=AlPO4+3KF
M(NH4OH)=14+5+16=35г/моль w(N)=14/35*100=40%
A) 2С2H5COOH + 2Na = 2C2H5COONa + H2
б) 2C2H5COOH + MgO = (C2H5COO)2Mg + H2O
в) C2H5COOH + KOH = C2H5COOK + H2O
г) 2C2H5COOH + Na2CO3 = 2C2H5COONa + CO2 + H2O
д) С2H5COOH + C2H5OH = C2H5COOC2H5 + H2O
N(NH3)=V/Vm=0,3л/22,4л=0,0134моль
m(NH3)=n*M=0,0134моль*17г/моль=0,23г
м р-ра = m(NH3)+m(H2O)=0,23г+200г=200,23г
ω(NH3)=м в-ва / м р-ра *100\%=0,23/200,23*100=0,12\%
Дано:
V (O2) = 11,2 л
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n (MgO) = ?
m (MgO) = ?
N (MgO) = ?
2Mg + O2 = 2MgO
n (O2) = V / Vm = 11,2 / 22,4 = 0,5 моль
n (MgO) = 2n (O2) = 1 моль
m (MgO) = n * M = 24 + 16 = 40 г
N (MgO) = n * NА = 6 * 10²³