The element you are looking for is Pb (Lead). Just check the last orbital on the periodic table to find it!
The oxidation state numbercan aid in identifying the unknown element present in both compounds. They denote the number of electrons that are either donated, received, or shared to yield compounds.
Remember the fundamental principles governing oxidation numbers.
1. In a neutral compound, the total of all oxidation numbers is zero.
2. Chlorine, bromine, and iodine typically exhibit an oxidation number of -1(unless paired with fluorine and oxygen)
Assume the oxidation state for element Mis designated as x.
Referring to rule 2, chlorine possesses an oxidation state of -1.
Now, for the compound MCl₂ (which is neutral), the equation can be formulated as
x + (2 * -1)= 0 ⇒ x₁= +2
For MCl₃, the corresponding equation is
x + (3 * -1)= 0 ⇒ x₂= +3
This indicates that the elementhas two distinct oxidation statesin its compounds, which are +2and +3.
The identified element is iron (Fe), as it shows +2 and +3 oxidation states across these compounds.
Memorizing this is essential. Regrettably, there isn't a simpler method to tackle these oxidation states.
The final answer is iron (Fe).
The resulting temperature is 46.5°C.
Details:
According to Charles's law, the volume of gas, while maintaining constant pressure, correlates directly with temperature in Kelvin.
The formula representing Charles's law is expressed as follows:
We need to determine T2, thus:
V1 = 736 ml = 0.736 L
T1 = 15 ° C
V2 = 2.28 L
Substituting the values gives us:
T2 = 
= 46.5°C
It is evident that as the volume increases, the temperature also rises.
(a)
Write the balanced half-reactions for the overall process:
Oxidation: Se^2- (aq) → Se
(s) + 2e-
Reduction: 2So3^2- (aq) + 3H2O (l) + 4e- →
S2O3^2- + 6OH- (aq)
(b)
Assuming E sulfite is 0.57 V, compute E selenium:
E anode = E cathode – E cell
= -0.57 – 0.35
=
-.092
The answer is B. 45k. Human bodies contain approximately 60 to 70% water.
