A.
Spaghetti is still visible and hasn’t been mixed homogeneously
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
Answer:
The volume occupied is 25.7 L
Explanation:
Let's replace all the data in the formula
P . V = N . k . T
N = nNA
1 gm.mole . 6.02x10²³
k = Boltzmann's contant
T = T° in K
1 atm = 1.013 × 10⁵ N/m2
1.013 × 10⁵ N/m2 . Volume = 6.02x10²³ . 1.38065 × 10⁻²³ N · m/K . 313.7K
Volume = (6.02x10²³ . 1.38065 × 10⁻²³ N · m/K . 313.7K) / 1.013 × 10⁵ m2/N
Volume = 2607.32 N.m / 1.013 × 10⁵ m2/N = 0.0257 m³
1 dm³ = 1 L
1m³ = 1000 dm³
25.7 L
Son átomos que tienen el mismo número atómico, pero diferente masa atómica. Es decir, contienen el mismo número de protones pero difieren en el número de neutrones. Como ejemplo, tendríamos el Hidrógeno y sus 3 isótopos, el Protio, el Deuterio y el Tritio.