Answer:
V KOH = 247.939 mL
Explanation:
at the point of equilibrium:
mol CH3COOH = mol KOH.......for weak acid system - strong bases...(1)
⇒ mol CH3COOH = 0.775L * 0.819 mol / L
⇒ mol CH3COOH = 0.634 mol CH3COOH.....(2)
replacing (2) in (1):
0.634 mol = V KOH * 2.56 mol / L
⇒ V KOH = 0.634 mol / (2.56 mol / L )
⇒ V KOH = 0.247939 L ( 247.939 mL )
The molality of a solution is expressed as the amount of the solute in moles per mass of the solvent in kilograms. In this case, the molality is equal to 400 g/62.07 g/mol/ 4 kg water. The molality is equal to 1.61 molal. The freezing point depression is determined through Tf- Kb*molality. Substituting, 0 deg - 1.86 * 1.61 m is equal to -2.99 degrees celsius.
The correct answer is organelles
It depends on the number of valence electrons required to make octet or duplet( in case of H)
. For example, Nitrogen(atomic number = 7) has electronic configuration(2,5) which means nitrogen has 5 valence electrons and requires 3 more electrons to complete its octet. After gaining 3 electrons from atoms of an element with less electronegativity than N, it forms nitride ion ().
Hope this helps.
1.1 / 2 = .7 --> 2.86 yrs
.7 / 2 = .45 —> 5.72 yrs
.45 / 2 = .225 —> 8.58 yrs
.225 / 2 = .1125 —> 11.44 yrs
So, for the sample of plutonium to reach .140 mg it should take a little less than 11.44 years.
Hope this helps