Answer:
Final temperature = 149 K
Explanation:
Given data:
Initial temperature = 25°C (25+273 = 298 K)
Initial volume = 4.5 L
Final temperature = ?
Final volume = 9.0 L
Solution:
The given problem will be solve through the Charles Law.
According to this law, The volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure.
Mathematical expression:
V₁/T₁ = V₂/T₂
V₁ = Initial volume
T₁ = Initial temperature
V₂ = Final volume
T₂ = Final temperature
Now we will put the values in formula.
V₁/T₁ = V₂/T₂
T₂ = T₁V₂/V₁
T₂ = 4.5 L × 298 K / 9.0 L
T₂ = 1341 L K / 9.0L
T₂ = 149 K
Salts of alkaline earth metals are less soluble than salts of alkali metals because <span>a higher cation charge concentrated on the smaller cations makes it hard to pull apart ionic lattices.The correct option among all the options that are given in the question is the third option or option "c". I hope it helps you.</span>
Answer:
0.4912 kJ/K
Explanation:
Using steam table, the properties of water at stage 1 can be determined:
= 400 kPa
= 60°C
Therefore, from steam table:
specific volume ![v_{1} = 0.001017 m^{3}/kg](https://tex.z-dn.net/?f=v_%7B1%7D%20%20%3D%200.001017%20m%5E%7B3%7D%2Fkg)
entropy ![s_{1} = 0.8313 kJ/kg*K](https://tex.z-dn.net/?f=s_%7B1%7D%20%20%3D%200.8313%20kJ%2Fkg%2AK)
Calculating the specific volume of water after the partition is removed, since the mass is constant and volume of water is doubled:
![v_{2} = 2*0.001017 = 0.002034 m^{3}/kg](https://tex.z-dn.net/?f=v_%7B2%7D%20%3D%202%2A0.001017%20%3D%200.002034%20m%5E%7B3%7D%2Fkg)
Final pressure of water in the tank = ![P_2} = 40 kPa](https://tex.z-dn.net/?f=P_2%7D%20%3D%2040%20kPa)
dryness factor after removing the partition
![x = \frac{0.002034 - 0.001026}{3.993 - 0.001026} = 2.524*10^{-4} kg/vapor](https://tex.z-dn.net/?f=x%20%3D%20%5Cfrac%7B0.002034%20-%200.001026%7D%7B3.993%20-%200.001026%7D%20%3D%202.524%2A10%5E%7B-4%7D%20kg%2Fvapor)
Therefore:
![s_{2} = s_{f2} + x*s_{fg2} = 1.0261 + (2.524*10^{-4}*6.643) = 1.02778 kJ/kg*K](https://tex.z-dn.net/?f=s_%7B2%7D%20%3D%20s_%7Bf2%7D%20%2B%20x%2As_%7Bfg2%7D%20%20%3D%201.0261%20%2B%20%282.524%2A10%5E%7B-4%7D%2A6.643%29%20%3D%201.02778%20kJ%2Fkg%2AK)
Thus, the entropy change is:
Δs = ![m*(s_{2}-s_{1}) = 2.5*(1.02778 - 0.8313) = 0.4912 kJ/K](https://tex.z-dn.net/?f=m%2A%28s_%7B2%7D-s_%7B1%7D%29%20%3D%202.5%2A%281.02778%20-%200.8313%29%20%3D%200.4912%20kJ%2FK)
Therefore, the entropy change of water is 0.4912 kJ/K
Answer:
Substances over 7 are categorized as basic, with 7 being the neutral point. Water has a pH level of 7. Substances with pH levels under 7 are categorized as acidic. Vinegar is acidic.
Explanation:
You can change it a little if you want. Hope this helps!
Answer:
solar power
Explanation:
charge your device from the sun