Answer:
a) grams of this impurity per kg of CCl4 = 3.416 g/kg of solvent.
b) mass purity % = 99.66%
Explanation:
Given, the freezing point of pure CCl₄ = - 23°C
Presence of impurities lowers the freezing point to - 23.43°C
The freezing point depression constant, Kբ = 29.8°C/m
The lowered freezing point is related to all the parameters through the relation
ΔT = i Kբ × m
where ΔT is the lowered freezing point, that is, the difference between freezing point of pure substance (T⁰) and freezing point of substance with impurities (T).
i = Van't Hoff factor which measures how much the impurities influence/affect colligative properties (such as freezing point depression) and for most non-electrolytes like this one, it is = 1
Kբ = The freezing point depression constant = 29.8°C/m
m = Molality = ?
T⁰ - T = i Kբ m
- 23 - (-23.43) = 1 × 29.8 × m
m = 0.43/29.8 = 0.0144 mol/kg
Them we're told to calculate impurity of the CCl₄
we convert the Molality to (gram of solute)/(kg of solvent) first
Solute = C₂Cl₆
Molar mass = 236.74 g/mol
So, (molality × molar mass) = (gram of solute)/(kg of solvent)
(gram of solute)/(kg of solvent) = 0.0144 × 236.74 = 3.416 (gram of solute)/(kg of solvent)
Mass purity % = (1000 g of pure substance)/(1000 g of pure substance + mass of impurity in 1000 g of pure substance)
1000 g of solvent contains 3.416 grams of impurities
Mass purity % =100% × 1000/(1003.416)
Mass purity % = 99.66 %
Respuesta:
2 m
Explicación:
Paso 1: Información provista
Paso 2: Calcular la concentración de la solución final
Queremos perparar una concentración diluida a partir de una concentrada. Podemos calcular la concentración de la solución diluida usando la regla de dilución.
C₁ × V₁ = C₂ × V₂
C₂ = C₁ × V₁ / V₂
C₂ = 4 m × 100 mL / 200 mL = 2 m
a base
an acid
neutrality
The correct answer is:
neutrality
on the pH scale 7 is neutral above 7 is basic and below 7 is acidic.
Explanation:
The pH is an example of how acidic/basic water is. The scale goes from 0 - 14, with 7 being neutral, pH of less than 7 designates acidity, whereas a pH of greater than 7 intimates a base. pH is really a pattern of the relative amount of free hydrogen and hydroxyl ions in the water.pH is a measure of how acidic/basic water is.
It is neutral because, at this pH, the molar concentrations of Hydroxide and Hydronium are same, therefore the substance is not a base nor an acid.
On the pH scale, a 7 represents neutrality. It is not considered acidic nor basic, but instead, it represents a balanced solution, such as pure water.
On the pH scale, a 7 indicates neutrality. This means that the solution is neither acidic nor basic. The pH scale ranges from 0 to 14, with 7 being the midpoint. Solutions with a pH less than 7 are considered acidic, while those with a pH greater than 7 are considered base or alkaline. So, a pH of 7 is indicative of a perfectly balanced solution, like pure water.
#SPJ6
cannot be depleted.
Agree or disagree
Answer:
Agree
Explanation:
Renewable energy resources are advantageous because they cannot be depleted with active usage.
Non-renewable energy resource cannot be replenished as they are being used in nature.
Such resources must be conserved.
1 30 seconds
2 32 seconds
3 10 seconds
4 29 seconds
Sugar does not dissolve in water.
The time recorded for Trial 3 may be inaccurate.
His experiment has very low precision.
Answer:
His experiment has very low precision
Explanation:
Precision is how close the answers are together. The answers are increasing in time. So, this makes sence. None of the answers are similar to one another.