a) An unknown liquid has a heat of vaporization of 31.97 kJ/mole. If the normal boiling point is 80, what is vapor pressure (in torr) of this liquid at room temperature of 25 degrees C? HINT: Normal boiling point occurs when the vapor pressure of the liquid is the same as atmospheric pressure (1 atm or 760 mm Hg).
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.
a) An unknown liquid has a heat of vaporization of 31.97 kJ/mole. If the normal boiling point is 80, what is vapor pressure (in torr) of this liquid at room temperature of 25 degrees C? HINT: Normal boiling point occurs when the vapor pressure of the liquid is the same as atmospheric pressure (1 atm or 760 mm Hg).
b) Image: Graph, Energy on X axis, Temp on Y axis. There is a line sloping up and to the right labelled "A" beginning near bottom of Y-axis. At end of this line, there is a horizontal line labelled "B". At the end of this line there is another line sloping up and to the right labelled "C". End of Image.
NH3 (MW = 17.034 g/mol)
Melting point = minus 77.73 degrees C
Boiling point = minus 33.34 degrees C
Heat capacity of liquid = 4.700 J/g/K
Heat capacity of gas = 2.060 J/g/K
Heat of vaporization = 23.40 kJ/mol
Find A, B and C (as far as 0 degrees C) and the total energy required (in that order) in Joules (express as 'J'). Assume 100.0 g of substance. A, B and C should have four significant figures.
When entering your values import your answer followed by a space then J
Example: 3450. J
Notice that in this particular example a decimal point was included after 3450 to indicate that the zero is significant. If the answer does not need a decimal do not include one.
1.____
2.____
3.____
4.____
Trending now
This is a popular solution!
Step by step
Solved in 3 steps with 3 images
