A flask containing neon gas is connected to an open-endedmercury manometer. The open end is exposed to the atmosphere, wherethe
1 answer:
Answer: Option (C) is the correct answer.
Explanation:
The given data is as follows.
= 745 torr
= - 50 (the value is negative because on the open side its level is lower than the side connected to the gas)
Now, formula to calculate the pressure of neon gas will be as follows.
Putting the given values into the above formula as follows.
=
= 695 torr
Thus, we can conclude that the neon pressure is 695 torr.
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Answer:
The enthalpy change during the reaction is -199. kJ/mol.
Explanation:
Mass of solution = m
Volume of solution = 100.0 mL
Density of solution = d = 1.00 g/mL
First we have to calculate the heat gained by the solution in coffee-cup calorimeter.
where,
m = mass of solution = 100 g
q = heat gained = ?
c = specific heat =
= final temperature =
= initial temperature =
Now put all the given values in the above formula, we get:
Now we have to calculate the enthalpy change during the reaction.
where,
= enthalpy change = ?
q = heat gained = 2.242 kJ
n = number of moles fructose =
Therefore, the enthalpy change during the reaction is -199. kJ/mol.