Which is the formula for diarsenic pentoxide? Ar2O5 As5O2 As2O5 2As5O
2 answers:
Answer : The correct option is,
Explanation :
Diarsenic pentoxide having the formula, . It is a covalent compound which is formed by the sharing of electrons between the two non-metals. The two non-metals are arsenic (As) and oxygen (O).
When the two arsenic atoms share their electrons to the five oxygen atoms to form covalent compound.
The formula of covalent compound is given by :
- The less electronegative element is written first.
- The more electronegative element is written second.
- If the prefixes are written with the elements then the prefix number is written in the subscript of the respective elements.
Hence, the formula for diarsenic pentoxide is,
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Answer:
The cell potential is 0.609 V. Given E > 0 the electrochemical cell is spontaneous as written.
Explanation:
Let's consider the oxidation and reduction half-reactions and the global reaction.
Anode (oxidation): Sn²⁺(0.0023 M) ⇒ Sn⁴⁺(0.13 M) + 2 e⁻
Cathode (reduction): 2 Fe³⁺(0.11 M) + 2 e⁻ ⇒ 2 Fe²⁺(0.0037 M)
Global reaction: Sn²⁺(0.0023 M) + 2 Fe³⁺(0.11 M) ⇒ Sn⁴⁺(0.13 M) + 2 Fe²⁺(0.0037 M)
The standard cell potential (E°) is the difference between the standard reduction potential of the cathode and the standard reduction potential of the anode.
E° = E°red,cat - E°red,an
E° = 0.771 V - 0.154 V = 0.617 V
The Nernst equation allows us to calculate the cell potential (E) under the given conditions.
The cell potential is 0.609 V. Given E > 0 the electrochemical cell is spontaneous as written.