Energy cannot be destroyed or created. Electricity is a form of energy which has to be created from other forms of energy. We have to pay for the creation of electricity because it requires certain resources to transform other energies into electricity.
Hydrologists primarily study water, i think
If the hydrogen ion concentration of an unknown solution is 4.56E-7, the pH of the solution will be 6.34 and it will form an acid.
<h3>How to calculate pH from H+?</h3>
The pH, which is the power of hydrogen, can be calculated from the hydrogen ion concentration using the following expression:
pH = - log [H+]
According to this question, the hydrogen ion concentration of an unknown solution is 4.56E-7. The pH is as follows:
pH = - log [4.56E-7]
pH = 6.34
Therefore, If the hydrogen ion concentration of an unknown solution is 4.56E-7, the pH of the solution will be 6.34 and it will form an acid.
Learn more about pH at: brainly.com/question/15289741
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<h2>Hello!</h2>
The answer is: 
<h2>Why?</h2>
First, we need to calculate the molecular weight of the acetone (CH3COCH3)
So,
Then,
Second, we need to calculate the mass of the acetone in the bottle
We need to remember that 
So,
Third, we need to calculate the number of moles:
Fourth, we need to calculate the number of atoms:
Remember, 
Therefore,
Have a nice day!
Balanced equation:
2 Fe₂O₃ + 3 C → 4 Fe + 3 CO₂
number of moles of Fe₂O₃ = weight (g) / molar mass = (2.86 x 10⁴ g) / 159.69 g/mol = 179 moles
number of moles of C = (9.05 x 10³) / 12 = 754.16 moles
2 moles of Fe₂O₃ reacts with 3 moles of C
so 179 moles of Fe₂O₃ need 268.5 moles of C only
so carbon present in excess (754.16) and Fe₂O₃ is the limiting reactant so the number of moles used from Fe₂O₃ will be all the 179 moles
