Answer:
2.30 × 10⁻⁶ M
Explanation:
Step 1: Given data
Concentration of Mg²⁺ ([Mg²⁺]): 0.039 M
Solubility product constant of Mg(OH)₂ (Ksp): 2.06 × 10⁻¹³
Step 2: Write the reaction for the solution of Mg(OH)₂
Mg(OH)₂(s) ⇄ Mg²⁺(aq) + 2 OH⁻(aq)
Step 3: Calculate the minimum [OH⁻] required to trigger the precipitation of Mg²⁺ as Mg(OH)₂
We will use the following expression.
Ksp = 2.06 × 10⁻¹³ = [Mg²⁺] × [OH⁻]²
[OH⁻] = 2.30 × 10⁻⁶ M
Answer:
3.900 km/min
7.677 × 10⁵ ft/h
Explanation:
Step 1: Given data
Speed of the object (s): 6500. cm/s
Step 2: Convert "s" to km/min
We will use the following conversion factors.
6500. cm/s × (1 km/10⁵ cm) × (60 s/1 min) = 3.900 km/min
Step 3: Convert "s" to ft/h
We will use the following conversion factors.
3.900 km/min × (3280.84 ft/1 km) × (60 min/1 h) = 7.677 × 10⁵ ft/h
Is it talking about the big bang theory?