<span>Kw = water autoionization constant=1.0 x 10-14 @ 25 °C
Kw = [H3O+] [OHÂŻ]
1.0 x 10-14= [x][x]
x=1.00 x 10ÂŻ7 M</span>
Half-life it tells you about the amount of time needed that half of the quantity of an isotope to disintegrate.
For carbon-14, assuming that the daughter isotope is a stable one and does not disintegrate further, you have:
<u>parent isotope</u> <u>daughter isotope</u> <u>years</u>
100% 0% 0
50% 50% 5,730
25% 75% 11,460
A combustion reaction is a reaction that reacts in the presence of oxygen molecules. Methane will release -3115 kJ/mol of heat.
<h3>What is a combustion reaction?</h3>
A combustion reaction includes the reaction between the chemical reactant and oxygen molecule to produce the product. The combustion reaction between methane and oxygen is given as:
CH₄(g) + 2O₂ (g) → CO₂(g) + 2H₂O (l), ΔH = -890 kJ/mol
The stoichiometry coefficient from the reaction gives 1 mole of methane releases -890 kJ/mol enthalpy.
So, 3.5 moles methane will release = 3.5 × -890 = -3115 kJ/mol
Therefore, -3115 kJ/mol of heat is released.
Learn more about combustion reaction here:
brainly.com/question/27823881
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Answer:
metamorphic rock
Igneous rock can change into sedimentary rock or into metamorphic rock.
Explanation:
The molar mass of CO2 is 44 grams per mole.
165 grams / 44 grams per mole of CO2 = 3.75 moles CO2
Using Avogadro’s law where 1 mole of substance equals
6.023 x 10^23 molecules
3.75 moles CO2 (6.023 x 10^23 molecules /mole) = 2.26 x 10^24 molecules CO2
