Answer:
V₂ = 60 cm³
Explanation:
According to Charle's Law, "Volume of given amount of gas is directly proportional to applied temperature at constant pressure". Mathematically,
V₁ / T₁ = V₂ / T₂ ---- (1)
Data Given:
V₁ = 30 cm³
T₁ = 10 °C = 10 + 273 = 283 K
V₂ = ?
T₂ = 293 °C = 293 + 273 = 566 K
Solution:
Solving equation 1 for V₂,
V₂ = V₁ × T₂ ÷ T₁
Putting values,
V₂ = (30 cm³ × 566 K) ÷ 283 K
V₂ = 60 cm³
It’s a base because it has hydroxide (oh) and not just hydrogen.
Answer:
0.0077 moles KI
Explanation:
From the definition of Molarity (M) solve for moles, substitute and determine #moles. That is, Molarity (M) = moles solute/Liter solution => moles solute = Molarity(M) x Volume(L) = 0.0296M x 0.2586L = 0.0077 moles KI.
Answer: option 3) 155 g
Explanation:
1) Releasing energy means that it changed from gas to liquid (or liquid to solid, but it is told that the NaCl changed into liquid).
That is because molecules in gas state are more energetic than in liquid state (molecules in gas state have more kinetic energy than molecules in liquid stated).
2) So, that means that the corresponding process is condenstation, and you have to use the latent heat of vaporization which is told to be 171 kJ/mol.
3) Calculations:
i) number of moles, n:
452 kJ = n × 171 kJ/mol ⇒ n = 452 kJ / 171 kJ/mol = 2.643 moles
ii) mass:
mass = n × molar mass = 2.643 moles × 58.443 g/mol = 154.46 g ≈ 155 g
The change in state from Liquid ➡ gas describes the process of evaporation.
