Answer: nn
Explanation:
The nanometre (international spelling as used by the International Bureau of Weights and Measures; SI symbol: nm) or nanometer (US spelling) is a unit of length in the metric system, equal to one billionth (short scale) of a metre (0.000000001 m).
Their tentacles act as propellers to help with a speedy escape
Answer:
-3.82ºC is the freezing point of solution
Explanation:
We work with the Freezing point depression to solve the problem
ΔT = m . Kf . i
ΔT = Freezing point of pure solvent - freezing point of solution
Let's find out m, molality (moles of solute in 1kg of solvent)
15 g / 58.45 g/mol = 0.257 moles of NaCl
NaCl(s) → Na⁺ (aq) + Cl⁻(aq)
i = 2 (Van't Hoff factor, numbers of ions dissolved)
m = mol /kg → 0.257 mol / 0.250kg = 1.03 m
Kf = Cryoscopic constant → 1.86 ºC/m (pure, for water)
0ºC - Tºf = 1.03m . 1.86ºC/m . 2
Tºf = -3.82ºC
Answer:
500 cubic centimeters of water
Consideting the definition of electrolyte, the concentration of Ba²⁺ is 0.750 M and the concentration of OH⁻ is 1.5 M.
<h3>Definition of electrolyte</h3>
An electrolyte is a substance that dissolves in water and gives rise to the formation of ions. Electrolytes can be weak or strong, depending on whether they are partially or totally ionized or dissociated in aqueous media.
A strong electrolyte is any substance that, when dissolved in water, exclusively causes the formation of ions with a practically irreversible dissolution reaction.
A weak electrolyte is a substance that, when dissolved in water, produces partial ions, with reversible reactions.
<h3>This case</h3>
The equation for dissociation is:
Ba(OH)₂ → Ba²⁺ + 2 OH⁻
You can observe that the mole ratio of Ba(OH)₂: Ba²⁺ is 1: 1 and the mole ratio of Ba(OH)₂: OH⁻ is 1: 2.
Since Ba(OH)₂ is a strong electrolyte, it dissociates completely. Then, the concentration of Ba²⁺ is 0.750 M and the concentration of OH⁻ is 2×0.750 M= 1.5 M
In summary, the concentration of Ba²⁺ is 0.750 M and the concentration of OH⁻ is 1.5 M.
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