Question

5.21 The table below gives the break and halt temperatures found in the cooling curves of two metals A and B. Construct a phase diagram consistent with the data of these curves. Label the regions of the diagram, stating what phases and substances are present. Give the probable formulas of any compounds that form. 1100 700 700 700 700 700 400 10.0 1060 1000 850 750 670 550 70.0 400 400 500 100.0

Answer 1

We have Given, mass of metal = m_m = 370 g initial temp = T_i = 450 degrees C mass of water = 1000 gram final temperature T_t = 56 initial temp of water = 30 degrees C we have equation, q = mc delta T where q = heat m = mass C = specific heat delta T change in temperature Heat followed to water q = mc delta t q = 1000 times (4.186 J/g degrees C)(56 - 30) 4.186 J/g degrees C = specific heat of water q = 108836 J same amount of heat released by metal hence, 108836 = 340 times C times (450 - 56) C = 0.8124 J/g degrees C rightarrow specific heat of glass