Answer the following questions based on the phase diagram (not to scale!) for hydrogen , H2 , and on the following data: ΔHfusion = 58.4 J/g, ΔHvap = 452 J/g, specific heat gas = 14.3 J/g·K (a) What is the normal melting point?___ K The normal boiling point?___ K (b) At what temperature and pressure do the three phases coexist in equilibrium? T=___ K, P =____ atm (c) Is hydrogen a solid, a liquid or a gas at room temperature and pressure? If a gas, is it a permanent gas? (d) Which is the more dense phase, the liquid or the solid? (e) A 38.5 g sample of liquid hydrogen is heated at a constant pressure of 1 atm from a temperature of 20.3 K to a temperature of 109.7 K. How much energy in kJ is required?______ kJ
States of Matter
The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).
Chemical Reactions and Equations
When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.
Answer the following questions based on the phase diagram (not to scale!) for hydrogen , H2 , and on the following data:
ΔHfusion = 58.4 J/g, ΔHvap = 452 J/g, specific heat gas = 14.3 J/g·K
(a) What is the normal melting point?___ K The normal boiling point?___ K
(b) At what temperature and pressure do the three phases coexist in equilibrium? T=___ K, P =____ atm
(c) Is hydrogen a
If a gas, is it a permanent gas?
(d) Which is the more dense phase, the liquid or the solid?
(e) A 38.5 g sample of liquid hydrogen is heated at a constant pressure of 1 atm from a temperature of 20.3 K to a temperature of 109.7 K. How much energy in kJ is required?______ kJ
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