Answer:
pH = 11.9
Explanation:
First, we <u>determine the number of OH⁻ moles dissolved</u>:
<em>80% of Ca(OH)₂ is dissolved</em>:
- 0.0005 mol * 80/100 = 4x10⁻⁴ mol Ca(OH)₂
<em>There are two OH⁻ moles per Ca(OH)₂ mol</em>:
- 4x10⁻⁴ * 2 = 8x10⁻⁴ mol OH⁻
Now we can <u>calculate the molar concentration of OH⁻</u> (moles/L):
- 100 mL ⇒ 100/1000 = 0.1 L
- [OH⁻] = 8x10⁻⁴ mol / 0.1 L = 8x10⁻³ M
Then we <u>calculate the pOH of the solution</u>:
- pOH = -log[OH⁻] = -log(8x10⁻³ M) = 2.10
Finally, we can <u>calculate the pH of the solution</u> using the equation
Entropy Change is calculated by (Energy transferred) / (Temperature in kelvin)
deltaS = Q / T
Q = (mass)(latent heat of fusion)
Q = m(hfusion)
Q = (500g)(333J/g) = 166,500J
T(K) = 32 + 273.15 = 305.15K
deltaS = 166,500J / 305.15K
deltaS = 545.63 J/K
Answer:
Atoms of the same element that differ in their numbers of neutrons are called isotopes. Many isotopes occur naturally. Usually one or two isotopes of an element are the most stable and common. Different isotopes of an element generally have the same physical and chemical properties.
Answer:
a. Exotérmica
b. Exotérmica
c. Endotérmica
Explanation:
- Las reacciones exotérmicas son aquellas que liberan calor al ambiente. Como consecuencia la temperatura final del sistema aumenta. Podemos reconocerlas porque el calor aparece como un producto.
- Las reacciones endotérmicas son aquellas que absorben calor del ambiente. Como consecuencia la temperatura final del sistema disminuye. Podemos reconocerlas porque el calor aparece como un reactivo.
a. La combustión del propano:
C₃H₈ (g)+ 5 O₂(g) ⇒ 3 CO₂(g) + 4 H₂O(g) + 531 kcal
La reacción es exotérmica por lo que el calor aparece como producto.
b. La formación de la sal de mesa:
2 Na(s) + Cl₂(g) ⇒ 2 NaCl(s) + 196 kcal
La reacción es exotérmica por lo que el calor aparece como producto.
c. La descomposición del pentacloruro de fósforo:
PCl₅(s) + 16 kcal ⇒ PCl₃(s) + Cl₂(g)
La reacción es endotérmica por lo que el calor aparece como reactivo.
Answer:
See explanation
Explanation:
Polymerization refers to the formation of a macro-molecule by the aggregation of small molecules called monomers. Monomers are the small molecules that are joined together to form a polymer.
The formation of a condensation polymer is accompanied by the loss of a small molecules such as water as shown in the image attached.
Succinic acid reacts with ethylenediamine to form a nylon type polymer. The nature of this reaction is detailed in the image attached to this answer. Recall that a polymer may contain (n) number of monomers joined together in the macromolecule.