Evaporation is the change from a liquid to gas
Answer:
146 kJ
Explanation:
There are two heat flows in this question.
Heat lost on cooling + heat lost on solidifying = 0
q₁ + q₂ = 0
mCΔT + nΔHsol = 0
Data:
m = 575 g
C = 0.449 J·K⁻¹g⁻¹
T_i = 1825 K
T_f = 1811 K
ΔHsol = -13.8 kJ·mol⁻¹
Calculations:
(a) Heat lost on cooling
ΔT = T_f - T_i = 1811 K - 1825 K = -14 K
q₁ = mCΔT = 575 g × 0.449 J·K⁻¹g⁻¹ × (-14 K) = -361 J = -3.61 kJ
(b) Heat lost on solidifying
(c) Total heat lost
q = q₁ + q₂ = -3.61 kJ - 142.1 kJ = -146 kJ
The heat lost was 146 kJ.
Answer: A. The compound CuCl is 500 times less soluble in sea water than it is in pure water.
pure water.
Explanation:
Any change in the equilibrium is studied on the basis of Le-Chatelier's principle.
This principle states that if there is any change in a equilibrium reaction, the equilibrium will shift in a direction so as to minimize the effect.
Thus when a common ion is introduced to an equilibrium reaction, the equilibrium will shift in a direction where the concentration of common ion is decreasing.
When common ion such as 
from NaCl in sea water is introduced to an equilibrium reaction, the equilibrium will shift in a direction where the concentration of common ion is decreasing i.e. in the left side and thus solubility of CuCl further decreases.
2.5 % w/v ( that means we have 2.5 grams of solute in 100 mL <span>solution )
1.00 mL = 1000 mL therefore:
2.5 g ------------- 100 mL
?? --------------- 1000 mL
1000 x 2.5 / 100 => 25.0 g of NaCl</span>
In scientific notation, the measurement of each figure to three significant measurements are as follows:
- 87.073 meters = 8.71 × 10⁻¹ meters
- 4.3621 × 10⁸ meters = 4.36 × 10⁸ meters
- 0.01552 meter = 1.55 × 10² meters
- 9009 meters = 9.01 × 10² meters
- 1.7777 x 10-3 m = 1.78 × 10⁻³ meters
- 629.55 meters = 6.30 × 10² meters
A significant figure is the digits in a number that is dependable and absolutely essential to express the quantity of a figure in positional notation. They are utilized to represent the appropriate degree of precision.
A scientific notation is used to express a large number in an easy decimal way multiplied by its power of 10.
From the given information, in scientific notation, and to three significant figures, we have:
- 87.073 meters = 8.71 × 10⁻¹ meters
- 4.3621 × 10⁸ meters = 4.36 × 10⁸ meters
- 0.01552 meter = 1.55 × 10² meters
- 9009 meters = 9.01 × 10² meters
- 1.7777 x 10-3 m = 1.78 × 10⁻³ meters
- 629.55 meters = 6.30 × 10² meters
Therefore, from the above concept, we can conclude that the scientific notation of each figure in three significant figures is shown in bold format.
Learn more about scientific notation here:
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