Answer:
There are 1.8×1024 atoms in 1.5 mol HCl
Explanation:
Answer:
The formula is H202 (hydrogen peroxide, known as hydrogen peroxide)
Explanation:
100%----34g
5, 9783%---X= (5, 9783%x 34g)/100% =2 g
1g---1 atom of H
2g----x= 2g x 1 atom of H/1g = 2 atom of H
100%----34g
94, 0217%---X= (94,0217%x 34g)/100% =32 g
16g---1 atom of 0
32g----x= 32g x 1 atom of 0/16g = 2 atom of 0
Answer:
Explanation:
From the information given:
Mass of carbon tetrachloride = 5 kg
Pressure = 1 bar
The given density for carbon tetrachloride = 1590 kg/m³
The specific heat of carbon tetrachloride = 0.84 kJ/kg K
From the composition, the initial volume of carbon tetrachloride will be:![= \dfrac{5 \ kg }{1590 \ kg/m^3}](https://tex.z-dn.net/?f=%3D%20%5Cdfrac%7B5%20%5C%20kg%20%7D%7B1590%20%5C%20kg%2Fm%5E3%7D)
= 0.0031 m³
Suppose
is independent of temperature while pressure is constant;
Then:
The change in volume can be expressed as:
![\int ^{V_2}_{V_1} \dfrac{dV}{V} =\int ^{T_2}_{T_1} \beta dT](https://tex.z-dn.net/?f=%5Cint%20%5E%7BV_2%7D_%7BV_1%7D%20%5Cdfrac%7BdV%7D%7BV%7D%20%3D%5Cint%20%5E%7BT_2%7D_%7BT_1%7D%20%5Cbeta%20dT)
![In ( \dfrac{V_2}{V_1}) = \beta (T_2-T_1)](https://tex.z-dn.net/?f=In%20%28%20%5Cdfrac%7BV_2%7D%7BV_1%7D%29%20%20%3D%20%5Cbeta%20%28T_2-T_1%29)
![V_2 = V_1 \times exp (\beta (T_2-T_1))](https://tex.z-dn.net/?f=V_2%20%3D%20V_1%20%5Ctimes%20exp%20%28%5Cbeta%20%28T_2-T_1%29%29)
![V_2 = 0.0031 \ m^3 \times exp (1.2 \times 10^{-3} \times 20)](https://tex.z-dn.net/?f=V_2%20%3D%200.0031%20%5C%20m%5E3%20%20%5Ctimes%20exp%20%20%281.2%20%5Ctimes%2010%5E%7B-3%7D%20%5Ctimes%2020%29)
![V_2 = 0.003175 \ m^3](https://tex.z-dn.net/?f=V_2%20%3D%200.003175%20%5C%20m%5E3)
However; the workdone = -PdV
![W = -1.01 \times 10^5 \ Pa \times ( 0.003175 m^3 - 0.0031 \ m^3)](https://tex.z-dn.net/?f=W%20%3D%20-1.01%20%5Ctimes%2010%5E5%20%5C%20Pa%20%5Ctimes%20%28%200.003175%20m%5E3%20-%200.0031%20%5C%20m%5E3%29)
W = - 7.6 J
The heat energy Q = Δ h
![Q = mC_p(T_2-T_1)](https://tex.z-dn.net/?f=Q%20%3D%20mC_p%28T_2-T_1%29)
![Q = 5 kg \times 0.84 \ kJ/kg^0 C \times 20](https://tex.z-dn.net/?f=Q%20%3D%205%20kg%20%5Ctimes%200.84%20%5C%20kJ%2Fkg%5E0%20C%20%5Ctimes%2020)
Q = 84 kJ
The internal energy is calculated by using the 1st law of thermodynamics; which can be expressed as;
ΔU = ΔQ + W
ΔU = 84 kJ + ( -7.6 × 10⁻³ kJ)
ΔU = 83.992 kJ
Answer is: reducin agent in this reaction is thiosulfate (S₂O₃²⁻).
Balanced chemical reaction: 2S₂O₃²⁻(aq) + I₂(aq) → S₄O₆²⁻(aq) + 2I⁻<span>(aq).
Reducing agent is element or compound who loose electrons in chemical reaction. Sulfur in </span>thiosulfate change oxidation number from +2 to +5 tetrathionate anion (two<span> sulfur </span>atoms in the ion have oxidation state<span> 0 and two atoms have oxidation state +5).</span>
Answer: 116 g of copper
Explanation:
![Q=I\times t](https://tex.z-dn.net/?f=Q%3DI%5Ctimes%20t)
where Q= quantity of electricity in coloumbs
I = current in amperes = 24.5A
t= time in seconds = 4.00 hr =
(1hr=3600s)
![Q=24.5A\times 14400s=352800C](https://tex.z-dn.net/?f=Q%3D24.5A%5Ctimes%2014400s%3D352800C)
of electricity deposits 63.5 g of copper.
352800 C of electricity deposits =
of copper.
Thus 116 g of Cu(s) is electroplated by running 24.5A of current
Thus remaining in solution = (0.1-0.003)=0.097moles