№1 Дано: m(NaCl) = 1,5 г Найти: N - ?; V - ?; n - ?; №2 Дано: N(Al2O3) = 9*10^23 Найти: n - ?; m - ?; V - ?; №3 Дано: n(O2) = 1,1 моль Найти: N - ?; m - ?; V - ?; №4 Дано: V(Ca(OH)2) = 75 л Найти: N - ?; m - ?; n - ?;
1. дано m(NaCL) = 1.5 g --------------------------- N-? V-? n-? M(NaCL) = 58.5 g/mol n(NaCL)= m/M= 1.5/58.5 = 0.026 mol V(NaCL) = n*Vm = 0.026*22.4 = 0.5824 L N(NaCL)=n*N(A) = 0.026*6.02*10^23 = 1.5652*10^22 молекул 2 . дано N(Al2O3)=9*10^23 молекул ---------------------- n-? m-? V-? M(Al2O3) = 102 g/mol n(Al2O3) = N(AL2O3) / N(A) = 9*10^23 / 6.02*10^23 = 1.5 mol m(Al2O3) = n(Al2O3)*M(AL2O3) = 1.5*102 = 153 g V(Al2O3)= n(Al2O3)*Vm =1.5*22.4 = 33.6 L 3. дано n(O2)= 1.1 mol --------------------------- N-? m-? V-? M(O2)=32 g/mol N(O2) = n(O2) * N(A) = 1.1*6.02*10^23 = 6.622*10^23 молекул m(O2) = n(O2)*M(O2) = 1.1*32= 35.2 g V(O2) = n(O2)*Vm = 1.1*22.4 = 24.64 g 4.дано V(Ca(OH)2) = 75 L ----------------------- N-? m-? n-? M(Ca(OH)2)= 74 g/mol n(Ca(OH)2) = V(Ca(OH)2) / Vm = 75/22.4= 3.35 mol N(Ca(OH)2)= n(Ca(OH)2)*N(A) = 3.35*6.02*10^23 = 2.0167*10^24 молекул m(Ca(OH)2)= n(Ca(OH)2)*M(Ca(OH)2) = 3.35*74= 247.9 g