Answer:
please clear ur ques with image
it's unable to be understood
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PH scale is used to determine how acidic or basic a solution is.
pH can be calculated as follows;
by knowing the ph we can calculate pOH
pH + pOH = 14
pOH = 14 - 8.1
pOH = 5.9
pOH is used to calculate the hydroxide ion concentration
pOH = -log[OH⁻]
[OH⁻] = antilog(-pOH)
[OH⁻] = 1.26 x 10⁻⁶ M
therefore hydroxide ion concentration is 1.26 x 10⁻⁶ M
From the sun, through the photosynthetic organisms which includes; green plants and algae, then to herbivores to carnivores and decomposers.
I hope this helps answer your question. <3
Answer: <span>O₂(g), Br₂(l) Fe(s), He(g)
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Justification:
1) The state variable given, ΔHf°, is <span>the standard
enthalpy of formation. By definition it is the change in the enthalpy that accompanies the
formation of a mole of compound in the standard state, from its
constituent elements in the standard state.
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2) Since the standard state of <span>O₂(g), Br₂(l) Fe(s), He(g) is the very same shown, they do not evolve any heat for its formation. This is, that is the same state of the constituents, and no change is involved.
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<span>That is why, </span><span>ΔHf°, of those elements is 0.
</span>
To balance a reaction, we must say to it that the number of elements in one side is equal to the other side. For a combustion reaction such as the one given, we first need to balance the number of carbon atoms, then the hydrogen atoms and lastly the oxygen atoms.
<span>C4H10 + 13/2O2 → 4CO2 + 5H2O.</span>
