14. Use the diagram below to answer parts ()(v). 15x2 pts] 1 atm 0.5 atm 50 150

Question

14. Use the diagram below to answer parts ()(v). 15x2 pts] 1 atm 0.5 atm 50 150 250 350 (1) Melting occurs along the (1)AC line (2) CB line (3) CD line (4) all of these (ii) The temperature and pressure at which all three phases can coexist in equilibrium is (1) 0.25 atm and 110°C (2) 1.0 atm and 140C (3) 1.25 atm and 300°C (4) 0.45 atm and 130°C (ii) From the phase diagram above, the minimum pressure at which this substance can exist in the (iv) The normal boiling point of this substance is approximately (v) What phase changes occur when the temperature is held constant at 140°C and the pressure is liquid phase is (1) 0.25 atm (2) 0.45 atm (3)1.0 atm (4) 1.2 atm (1) 25°C (2) 140°C (3) 300°C (4) 350 increased from 0.25 atm to 1.4 atm? (1) gas liquid solid (3) liquid solid gas (4) solid liquid vapor (2) gas solid liquid 15. Ethyl chloride, CaHsCl, is used as a local anesthetic. It works by cooling tissue as it vaporizes. The (AHao)is 26.4 kJ/mol. How much heat (in kJ) could be removed by 100.0 g of heat of vaporization ethyl chloride? 6 pts)

Explanation / Answer

14)
i)
Melting occur between solid and liquid
So, the line between solid and liquid is the answer
CB line
Answer: 2

ii)
This is called triple point where all phases are present
This is indicated by point C in graph
Answer: 4

iii)
normal boiling point is at 1 atm
So, the atm, we need to find temperature at line CD which is 300 oC
Answer: 3

iv)
It will pass through gas, then liquid and finally solid
Answer: 1

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