Importance<span> of </span>Valence Electrons<span>. When two atoms approach each other and react with each other, it is their outer shells that come into contact first, and it is therefore the </span>electrons<span> in their outer shells that are normally involved in any chemical reaction.</span>
Answer:
H₃PO₄(aq) ⇄ H₂PO₄⁻(aq) + H⁺(aq)
Explanation:
The phosphoric acid fuel cell (PAFC) employs phosphoric acid (H₃PO₄), a weak acid that dissociates in 3 steps, each with its acid dissociation constant.
H₃PO₄(aq) ⇄ H₂PO₄⁻(aq) + H⁺(aq) Ka1
H₂PO₄⁻(aq) ⇄ HPO₄²⁻(aq) + H⁺(aq) Ka2
HPO₄²⁻(aq) ⇄ PO₄³⁻(aq) + H⁺(aq) Ka3
b
Explanation:
oh will combine with h to form water
Answer:
20.9 min time taken forn 99.0% of a sample of pure .
Explanation:
From the given,
half line of = 3.1 min
The ratio of the initial amount and amount in time is calculated as follows.
Now 99% got delayed, the left amount will be 1%.
Therefore, 20.9 min time taken forn 99.0% of a sample of pure .
Answer:
-4.278 ×10³ kJ
Explanation:
The equation of the reaction is as follows:
The volume of acetone = 177mL
the density of acetone = 0.788 g/mL
Now;
To determine the mass of acetone ; we use the relation
mass = density × volume
mass = 177 mL × 0.788 g/mL
mass = 1.39 × 10² g
Since number of moles =
number of moles of acetone =
number of moles of acetone = 2.39 moles
Given that -1790 kJ of heat is released for one mole of combustion of acetone. To calculate the amount of heat released with 2.39 moles of acetone; we have:
= -4278.1 J
= -4.278 ×10³ kJ