Answer:
1.7 * 10^-5
Explanation:
1- get the number of moles of PbCl2:
number of moles = mass / molar mass
number of moles = 0.45 / 278.1 = 1.618 * 10^-3 moles
2- get the concentration of Pb2+:
molarity = number of moles of solute / volume of solution in liters
molarity = (1.618 * 10^-3) / (0.1) = 0.0162 M
3- getting concentration of Cl-:
<span>PbCl2(s) <==> Pb2+(aq) + 2Cl-(aq)
</span>We can note that:
For a certain amount of Pb2+ formed, twice this amount of Cl- is formed.
This means that:
for 0.0162 M of Pb2+, 2*0.0168 = 0.0324 M of Cl- is formed
4- getting Ksp:
Ksp = [Pb2+][Cl-]²
Ksp = (0.0162)*(0.0324)²
Ksp = 1.7 * 10^-5
Hope this helps :)
Answer:
A non example of a galaxy is a star
Acid rain slowly dissolves rocks due to chemical reactions between the acid and the minerals in the rock. Differential Weathering: Softer, less resistant rocks wear away at a faster rate than more weather resistant rocks. More exposure to acid rain results in more rapid weathering.
9086.3J
Explanation:
Given parameters:
Mass of water = 18.5g
Initial temperature of water = 35°C
Finial temperature = -5°C
Unknown:
Amount of heat given off = ?
Solution:
In converting the water to ice, the water goes through these processes:
35°C to freezing point at 0°C = mcΔT
0°C of water to 0°C of ice = mL
0°C of ice to -5°C = mcΔT
The heat given off;
H = mc₁ΔT + mL + mc₂ΔT
m is the mass of water
c₁ is the specific heat capacity of water = 4.2J/g °C
c₂ is the specific heat capacity of ice = 2.03J/g °C
L is the latent heat of fusion = 334J/g
ΔT = T₂ - T₁ = temperature change
H = 18.5 x 4.2 + (0-(-35)) + (18.5 x 334) + (18.5 x 2.03 x (-5 - (0))
H = 2719.5J + 6179J + 187.8J = 9086.3J
learn more:
Specific heat brainly.com/question/7210400
#learnwithBrainly
Chemistry is the only type of science that studies how substances change.
Hope this helps you :)
