物化上-Exercise 1-考研试题文档资料系列.doc

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1、Exercise 1 The specific heat capacity Cp for mixtures of silybin (1) + PVP K30 (2) were measured at temperature T ranging from 298.15 to 370.15 K by differential scanning calorimeter, DSC. The Cp data are listed in the Table. Please construct the curves of Cp vs. T for w1, the mass fraction of compo

2、nent 1, from 0 to 0.4 in one figure, respectively.The dependence of Cp on temperature can be expressed by Eq. (1) in the range from an initial temperature Ti to a final temperature Tf. (1)Where, (2)Please give the coefficients ai of Eq.(1) by fitting experimental data of Cp. If a linear relationship

3、 between ai and w1 is supposed (3)Please give the coefficients of Eq.(3) for every ai in Eq. (1), respectively. The change in thermodynamic properties from the initial temperature Ti to a given temperature T, for example enthalpy change H=H(T)-H(Ti), can be calculated from the data of Cp. Please giv

4、e the values of enthalpy change at temperature T, and construct the curves of H against T for all the mixtures with mass fraction w1. Table. The Cp /J.K-1.g-1 for mixtures of silybin (1) + PVP K30 (2) with mass fractions w1= 0, to 0.4 at temperature T by DSC method T/Kw100.10.20.30.4298.151.2661.221

5、.1991.1541.111299.151.271.2251.2021.1581.116300.151.2741.231.2061.1621.123301.151.2821.2361.2091.1671.13302.151.2911.2431.2141.1721.136303.151.31.251.2181.1771.141304.151.3071.2561.2231.1821.147305.151.3131.2621.2281.1871.152306.151.321.2681.2331.1921.158307.151.3251.2731.2381.1961.163308.151.3311.2

6、791.2421.21.168309.151.3371.2841.2461.2041.173310.151.3431.291.2521.2091.179311.151.3491.2961.2571.2141.184312.151.3551.3011.2621.221.19313.151.3621.3081.2671.2261.196314.151.3681.3141.2731.2321.202315.151.3741.3211.2791.2391.208316.151.3811.3261.2851.2451.215317.151.3871.3331.2921.2521.222318.151.3

7、941.341.2981.2591.23319.151.41.3491.3061.2661.238320.151.4071.3571.3121.2731.247321.151.4141.3651.3191.281.255322.151.4211.3731.3251.2871.262323.151.4291.3821.3321.2941.27324.151.4381.391.3381.3011.277325.151.4481.41.3451.3071.284326.151.4571.4091.3511.3151.291327.151.4661.4181.3591.3221.297328.151.

8、4741.4271.3661.3291.303329.151.4821.4361.3731.3361.309330.151.491.4451.381.3431.316331.151.4981.4551.3881.3511.323332.151.5071.4651.3951.3581.329333.151.5161.4751.4041.3651.336334.151.5261.4851.4111.3721.343335.151.5351.4941.4181.3791.35336.151.5451.5031.4251.3851.356337.151.5541.5111.4311.3921.3633

9、38.151.5631.5191.4381.3981.369339.151.5711.5261.4441.4031.374340.151.581.5341.451.4081.379341.151.5891.5431.4581.4141.384342.151.5971.551.4641.4191.387343.151.6051.5571.4711.4241.391344.151.6131.5641.4771.4281.394345.151.621.571.4841.4331.398346.151.6271.5761.4891.4361.402347.151.6341.5811.4941.4391

10、.405348.151.641.5861.4981.4411.409349.151.6451.591.5021.4431.413350.151.6511.5951.5071.4461.416351.151.6561.5981.5111.4481.419352.151.6611.6021.5151.4511.422353.151.6661.6051.5191.4541.425354.151.671.6071.5221.4561.428355.151.6731.6081.5241.4581.43356.151.6751.6081.5261.4591.432357.151.6771.6081.528

11、1.4591.434358.151.6781.6081.531.461.435359.151.6781.6071.5311.461.436360.151.6761.6061.5321.461.437361.151.6751.6041.5321.461.438362.151.6721.6021.5321.461.439363.151.671.61.5321.4611.439364.151.6681.5981.5331.4611.44365.151.6661.5961.5331.4621.441366.151.6641.5951.5341.4631.443367.151.6611.5931.5361.4641.444368.151.6581.5911.5371.4661.446369.151.6541.5891.5391.4671.447370.151.651.5861.5391.4691.449