The concentration of hydroxide ion of a solution with a pH of 8. 25 is 1.77×
M
Calculation,
The pH of a solution tells us about concentration of the
ion ( proton ) in solution. However, if we know the value of pH , we can calculate pOH with the help of pH and from pOH we can find concentration of hydroxide ions in the solution.
pH + pOH = 14
8. 25 + pOH = 14
pOH = 14 - 8. 25 = 5.75
Since, pH = -㏒[
]
Similarly, pOH = -㏒[
]
If pOH = 5.75 , that means that -㏒[
] = 5.75 ,which means that,
[
] =
= 1.77×
.
So, we know that the concentration of the
ions in the solution with pH of 8.25 is 1.77×
Molar
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4.1 Moles of Cobalt = 241.62612 Grams
Answer:
find heat released by the burn:
(2 g) (19.4 kJ/g) = 38.8 kJ released
find heat gained by the water:
dH = m C dT
dH = (2250 g) (4.184 J/g-C) (+ 3.17 C)
dH = 29,842 Joules
aka
dH water = + 29.8 kJ
find the missing heat given to the calorimeter
(38.8 kJ released) - (29.8 kJ given to water) = 9.0 kJ given to calorimeter
What is the heat capacity of the empty bomb calorimeter
(9.0 kJ given to calorimeter) / (3.17 C rise in temp) = 2.84 kJ / C
Answer:
20.0 g of water is heated from 16.8 °C to 39.2 °C.
35.0 g of water is cooled from 56.5 °C to 5.9 °C.
50.0 g liquid water is heated from 0.0 °C to 100.0 °C.
25.0 g of ice is warmed from -25.0 °C to 0.0 °C, but does not melt.
30.0 g of steam heats from 373.2 K to 405.0 K.
Explanation:
Given,
The heat of combustion of octane = 1.308×10³ kcal/mol
It means that combustion of 1 mole of octane produces 1.308×10³ kcal of energy
Given mass = 406 g
Molar mass of octane = 114.23 g/mol
The formula for the calculation of moles is shown below:
Thus,
Moles of octane = 3.5542 moles
Combustion of 3.5542 moles produces 3.5542×1.308×10³ kcal of energy
<u>Energy released from 406 grams of octane = 4.649×10³ kcal</u>
Also given,
The heat of combustion of ethanol = 326.7 kcal/mol
It means that combustion of 1 mole of octane produces 326.7 kcal of energy
Given mass = 406 g
Molar mass of octane = 46.07 g/mol
The formula for the calculation of moles is shown below:
Thus,
Moles of octane = 8.8127 moles
Combustion of 8.8127 moles produces 8.8127×326.7 kcal of energy
<u>Energy released from 406 grams of ethanol= 2879.11 kcal = 2.879×10³ kcal</u>
<u>It is less.</u>