题目
A和B形成相合熔点化合物AB：A，B，AB 在固态时完全不互溶；A，AB，B 的熔点分别为20.C，300C，400C，A与AB及AB与B形成的两个低共熔点分别为150C，xB,E1=0.2 和250C，xB,E2=0.8。（1）画出以上述系统的熔点-组成（t-xB）图；（2）画出以下两条步冷曲线：xB=0.1的系统从200 C冷却到100 C，及xB=0.5的系统从400 C冷却到200C；（3）8 mol B和12 mol A 混合物冷却到无限接近150 C时，系统是哪几相平衡？各相的组成是什么？各相物质的量是多少？A and B can form a stable compounds AB: A,B and AB are immiscible in solid phase; The melting point of A, AB and B are 20.℃,300℃and 400℃ respectively. A andAB, B and ABcan form two lowes. eutectic mixtures. eutectic point and composition of eutectic mixture corresponding are: 150C，xB,E1=0.2 and 250C，xB,E2=0.8.(1) Draw m.lting point-composition diagram (t-xB)of the above system.;(2) draw the cooling curve of the following two system: system with xB=0.1 cooling from 200 C.to 100 C and system with xB=0.5 cooling from 400 C to 200 C.(3) mixture formed by 8 mol B and 12 mol A cooling nearly to 150 C, how many phases are in equilibrium? the component of every phase? how much the amount of substance of every phase?
A和B形成相合熔点化合物AB：A，B，AB 在固态时完全不互溶；A，AB，B 的熔点分别为2
0.C，300C，400C，A与AB及AB与B形成的两个低共熔点分别为150C，xB,E1=0.2 和250C，xB,E2=0.8。（1）画出以上述系统的熔点-组成（t-xB）图；（2）画出以下两条步冷曲线：xB=
0.1的系统从200 C冷却到100 C，及xB=0.5的系统从400 C冷却到200C；（3）8 mol B和12 mol A 混合物冷却到无限接近150 C时，系统是哪几相平衡？各相的组成是什么？各相物质的量是多少？A and B can form a stable compounds AB: A,B and AB are immiscible in solid phase; The melting point of A, AB and B are 2
0.℃,300℃and 400℃ respectivel
y. A andAB, B and ABcan form two lowe
s. eutectic mixtures. eutectic point and composition of eutectic mixture corresponding are: 150C，xB,E1=0.2 and 250C，xB,E2=0.
8.(1) Draw
m.lting point-composition diagram (t-xB)of the above system.;(2) draw the cooling curve of the following two system: system with xB=
0.1 cooling from 200
C.to 100 C and system with xB=0.5 cooling from 400 C to 200 C.(3) mixture formed by 8 mol B and 12 mol A cooling nearly to 150 C, how many phases are in equilibrium? the component of every phase? how much the amount of substance of every phase?
0.C，300C，400C，A与AB及AB与B形成的两个低共熔点分别为150C，xB,E1=0.2 和250C，xB,E2=0.8。（1）画出以上述系统的熔点-组成（t-xB）图；（2）画出以下两条步冷曲线：xB=
0.1的系统从200 C冷却到100 C，及xB=0.5的系统从400 C冷却到200C；（3）8 mol B和12 mol A 混合物冷却到无限接近150 C时，系统是哪几相平衡？各相的组成是什么？各相物质的量是多少？A and B can form a stable compounds AB: A,B and AB are immiscible in solid phase; The melting point of A, AB and B are 2
0.℃,300℃and 400℃ respectivel
y. A andAB, B and ABcan form two lowe
s. eutectic mixtures. eutectic point and composition of eutectic mixture corresponding are: 150C，xB,E1=0.2 and 250C，xB,E2=0.
8.(1) Draw
m.lting point-composition diagram (t-xB)of the above system.;(2) draw the cooling curve of the following two system: system with xB=
0.1 cooling from 200
C.to 100 C and system with xB=0.5 cooling from 400 C to 200 C.(3) mixture formed by 8 mol B and 12 mol A cooling nearly to 150 C, how many phases are in equilibrium? the component of every phase? how much the amount of substance of every phase?
题目解答
答案
(3) nS ( AB )=12.34mol ,n l ( A+B ) =6.67 mol