Answer: Option (b) is the correct answer.
Explanation:
When we compare the solubilities of the noble gases in water, then solubility increases from the smallest atomic weight to the largest, Ar < Kr < Xe. This is because more is the atomic weigh of the gas more will be the dispersion forces present in it.
As a result, it will have more number of attractive interactions with the water molecules. Therefore, more is the attraction more will be the solubility of the gas.
Thus, we can conclude that the statement heavier the gas, the more dispersion forces it has, and therefore the more attractive Interactions it has with water molecules, is the best explanation.
Answer:
We have 8.4 * 10^10 nickel atoms
Explanation:
step 1: Data given
Mass of nickel = 8.30 * 10^-12 grams
Number of avogadro = 6.02 * 10^22 / mol
Atomic mass nickel = 58.69 g/mol
Step 2: Calculate moles nickel
Moles nickel = mass nickel / atomic mass nickel
Moles nickel = 8.30 * 10^-12 grams / 58.69 g/mol
Moles nickel = 1.4*10^-13 moles
Step 3: Calculate nickel atoms
Nickel atoms = moles nickel * number of Avogadro
Nickel atoms = 1.4 * 10^-13 moles * 6.02 * 10^23 /mol
Nickel atoms = 8.4* 10^10 atoms
We have 8.4 * 10^10 nickel atoms
Answer: Diagram C
Explanation:
When a body is under the influence of 2 or more forces, the effect of all forces may be replaced by a unique force (resulting force), with the same result as all original forces.
In case you have different forces with the same direction but different sense, all forces may be substituted by one resulting force, though the module of this resulting force will be equal to the absolute value of the substraction of the modules of the individual forces
For case C, you should check: 8 N (force with right sense) + 4 N (force with right sense) - 4 N (force with left sense) would give us a resulting force of 8 N (with right sense), which will accelerate the body to the right
Explanation:
We have to calculate value.
It is known that at the equivalence point concentration of acid is equal to the concentration of anion formed.
Hence, [HA] =
Now, relation between and pH is as follows.
pH =
Putting the values into the above formula as follows.
pH =
4.23 = (as [HA] = )
= 4.23 (as log (1) = 0)
or, = 4
Thus, we can conclude that of given weak acid is 4.