7. Consider the phase diagram for hydrogen 13.0 solid liquid 1.0 E 0.07 gas -259

Question

7. Consider the phase diagram for hydrogen 13.0 solid liquid 1.0 E 0.07 gas -259 -253 -240 Temnerature. °C (not to scale) (a) Give the normal boiling point of hydrogen. Answer: (b) Give the normal melting point of hydrogen. Answer: (c) What phase(s) is/are present at -262°C and 10 atm? Answer: (d) What phase(s) is/are present at -259°C and 0.07 atm? Answer: e) What phase(s) is/are present at -253°C and 0.40 atm? Answer: () What phase(s) is/are present at-253°C and 1.00 atm? Answer (g) What is the critical temperature of hydrogen? Answer: (h) What is the critical pressure of hydrogen? Answer:

Explanation / Answer

a)

normal boiling point occur at 1 atm

at 1 atm and touching line liquid-gas is -253 oC

Answer: -253 oC

b)

normal freezing point occur at 1 atm

at 1 atm and touching line liquid-solid is -259 oC

Answer: -259 oC

c)

Only solid is present

d)

This point is triple point

so all solid, liquid, gas will be present

only 4 parts at a time

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