Oxygen was first produced via photosynthesis as ocean microbes evolved in the event that was called the Great Oxidation Event. Therefore the correct answer is C
This problem can be solved by Dalton's law of partial pressures which states that <em>in a mixture of non-reacting gases, the total pressure exerted is equal to the sum of the partial pressures of the individual gases</em>.
Ptotal = P₁ + P₂ + P₃ + ..... + Pn
Herein, Ptotal = P(Ne) + P(Ar) + P(He)
Ptotal = 1.25 atm, P(Ne) = 0.68 atm and P(Ar) = 0.35
So, P(He) = Ptotal - P(Ne) - P(Ar) = 1.25 - 0.68 - 0.35 = 0.22 atm
the laws of thermodynamics
Explanation:
The movement of thermal energy is controlled by the laws of thermodynamics.
- The total energy of a system is the sum of all its potential and kinetic energy associated with it.
- Thermal energy is a form of kinetic energy that causes the motion of particles of medium.
- It is produced when there is temperature differences between two bodies.
- The movement of thermal energy is from a body with a high energy to a low one.
- When thermal equilibrium is reached between two bodies, thermal energy ceases to flow.
- Thermodynamics deals with heat changes.
learn more:
Thermodynamics brainly.com/question/3564634
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Answer:
A carcinogen is any substance that promotes carcinogenesis, which is a type of deadly cancer to humans so essentially you are asking why a cancer-causing substance is dangerous...
Carcinogens cause genetic abnormalities that become tumors. So I suppose they are really dangerous because they heavily increase the likelihood of developing cancerous tumors :)
Answer:
0.01228 moles OH⁻
Explanation:
The reaction of H₂SO₄ with KOH is:
H₂SO₄ + 2KOH → K₂SO₄ + 2H₂O
Thus, we need to determine the moles of H2SO4 and KOH that reacts:
<em>Moles H₂SO₄:</em>
0.02173L * (0.142mol/L) = 3.086x10⁻³mol
<em>Moles KOH:</em>
0.04893L * (0.377mol/L) = 0.01845 mol KOH
The moles of KOH that reacts are:
3.086x10⁻³mol H₂SO₄ * (2 mol KOH / 1 mol H₂SO₄) = 6.172x10⁻³ moles KOH
And will remain in solution:
0.01845 mol KOH - 6.172x10⁻³ moles KOH = 0.01228 moles of KOH =
<h3>0.01228 moles OH⁻</h3>
