Given the graph (right), what is the boiling point of carbon tetrachloride under
ID: 1018758 • Letter: G
Question
Given the graph (right), what is the boiling point of carbon tetrachloride under an external pressure of 0.80 atm. 60 degree C 34 degree C 98 degree C 72 degree C Graph does not give that information Based on the graph in question 57, at what external pressure will CHCI_3 have a boiling point of 60 degree C? 800 torr 700 torr 650 torr 450 torr 270 torr Water placed in a glass tube forms downward U-shaped meniscus (concave surface) because the adhesive force between the water and the glass are greater than the cohesive forces between water molecules. Mercury in glass tube forms inverted U meniscus (convex surface) because mercury atoms form stronger bonds (metal bond) with one another than they form bonds with the glass. If the inside surface of each tube were coated with wax, would the general shape of the water meniscus change? Would the general shape of the mercury meniscus change?Explanation / Answer
57. Question
1 atm = 760 tor
therefore 0.8 atm = 760*08 = 608 tor
from the graph 608 tor on y-axis intercepts CCl4c urve approximately at 72 oC
58. Question
from the graph the 60oC on x-axis gives an intercept at approxamitely 700 tor for CHCl3
59. Question
As water forms U shaped meniscus with glass due to capillary action, when the surface is coated with wax cohesive forces predominates over adhesive forces and hence it forms a inverted U
In the case of mercury, cohesive forces are mode predominentdue to metallic bonds. Hence no changeoccurs for wax coated glass tube.
Hence option D. appears to be correct.
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