Answer:
C) is less than 7
Explanation:
The dissociation constant, Ka of nitrous acid, HNO2 = 4.5 * 10^-4
Ammonia, NH3, is a weak base with a Kb value of 1.8x10^-5
When a weak acid like HNO2 reacts with an equivalent amount of a weak base NH3, complete neutralization does not occur. The concentrations of the species in equilibrium with each other will depend on the equilibrium constant, K, for the reaction,
Since the dissociation constant, ka of nitrous acid is higher, at equivalence point the pH of the solution will be slightly acidic with a pH that is less than 7.
Explanation:
The given data is as follows.
mass = 0.158 g, volume = 100 ml
Molarity = 1.0 M, =
The given reaction is as follows.
So, moles of magnesium will be calculated as follows.
No. of moles =
=
=
= 0.0065 mol
Now, formula for heat released is as follows.
Q =
=
=
= 3010.32 J
Hence, heat of reaction will be calculated as follows.
=
= -4.63 J/mol
or, = (as 1 kJ = 1000 J)
Thus, we can conclude that heat of given reaction is kJ/mol.
Argon is perticularly important for the metal industry, being used as an inert gas shield in arc
Close to about -36 degrees Celsius ( - 33 degrees Fahrenheit) in January but can drop to -60 degrees Celsius ( - 76 degrees Fahrenheit).
in July, it can be close to -19 degrees Celsius (- 2 degrees Fahrenheit)