Answer:
Explanation:
Given
Initial Form: Onyx
Final Form: Rectangular Solid
Dimension of Solid = 5.10 cm by 5.10 cm by 2.50 mm
Required
Volume of the solid (in cm³)
The volume of a solid is calculated as thus;
Assume the following;
The first thing to do is to convert the assumed height from mm to cm
Given that;
This implies that
Hence, the dimension of the solid in cm is:
The Volume is then calculated as;
Hence, the volume of the rectangular solid is
<span>Ideal Gas Law is as follows:
PV = nRT
Now lets rearrange so we can get rid of some variables.
V/n = RT/P
Assuming temperature and pressure are the same (atmospheric pressure), we can get:
PV/n = constant (k)
Now since we are dealing with an initial state (2.3 moles, 1.4 liters) lets set that as
V1 and n1 and the final state as V2 and n2
.V1/n1 = constant (k)
V2/n2 = constant (k)
Because the constant is the same (remember me making the assumptions above??)
V1/n1 = V2/n2
now rearrangement:
n1/V1/V2 = 1/n2 -1 = n2
Answer: 11.8 moles are in the final vessel. So to answer the question how much was ADDED, we need to subtract the initial mole number.
11.8 - 2.3 mols = 9.5 mols added</span>
Answer is: pH of methylamine
is 11.78.<span>
</span>
Chemical reaction: CH₃NH₂(aq)+
H₂O(l) ⇌ CH₃NH₃⁺(aq) + OH⁻<span>(aq).
Kb(CH</span>₃NH₂) =
4,4·10⁻⁴.<span>
c</span>₀(CH₃NH₂) = n(CH₃NH₂) ÷ V(CH₃NH₂).
c₀(CH₃NH₂) = 0.070 mol ÷ 0.8 L = 0.0875 M.
c(CH₃NH₃⁺) = c(OH⁻) = x.
c(NH₂OH) = 0.0875 M - x; equilibrium concentration of methylamine.
Kb = c(CH₃NH₃⁺) · c(OH⁻) / c(CH₃NH₂).
0.00044 = x² / (0.0875 M - x).
Solve quadratic equation: x = c(OH⁻) = 0.00598 M.
pOH = -log(0.00598 M) = 2.22.
pH = 14 - 2.22 = 11.78.
Answer:
4HCl(g)+O2(g)= 2H2O(g)+2Cl2(g)
∆H=-27.36 kcal
Explanation:
The balanced equation shows that four molecules of HCl reacts with one molecule of Oxygen to give two molecules of water and two molecules of chlorine gas and evolves energy in a combustion reaction.
