Answer : The concentration of the HCl in original bottle is 0.56 M.
Explanation :
According to neutralization law:
where,
= concentration of HCl
= concentration of NaOH
= volume of HCl
= volume of NaOH
Given:
= ?
= 0.25 M
= 10 mL
= 22.4 mL
Now put all the given values in the above formula, we get:
Therefore, the concentration of the HCl in original bottle is 0.56 M.
Answer:
0 %
Explanation:
As we know 10.81 is the average atomic mass of boron which can not be contained by a single boron atom. Therefore, when isolated, a single boron atom will weight either 10 amu for ¹⁰B and 11 amu for ¹¹B respectively.
The average atomic mass is calculated as;
Atomic Mass of ¹⁰B = 10
Atomic Mass of ¹¹B = 11
Natural Abundance of ¹⁰B = 20 %
Natural Abundance of ¹¹B = 80 %
So,
Average Atomic Mass = (10 × 0.2) + (11 × 0.8)
Average Atomic Mass = 2 + 8.8
Average Atomic Mass = 10.8
The correct option is D.
The solubility of silver chloride in water is higher than that of silver bromide and the solubility of silver bromide in water is higher than that of silver iodide. This illustrates the differences in the reactivites of elements in the same group.
The oxidation number of a pure element is zero.