Answer: 1.15 moles
Explanation:
1 mole = 6.02214076*10^23 molecules
Answer:
The answer to your question is pH = 9.08
Explanation:
Data
pH = ?
Concentration = 1.2 x 10⁻⁵ M
Process
1.- Calculate the pOH of the solution
Formula
pOH = -log[OH⁻]
pOH = -log[1.2 x 10⁻⁵]
pOH = 4.92
2.- Calculate the pH
Formula
pH = 14 - pOH
Substitution
pH = 14 - 4.92
Result
pH = 9.08
Answer:
d. The density of a substance is always the same, regardless of temperature.
Explanation:
Density is a characteristic property of water and defined as the mass per unit volume.
The density of a substance always remains the same at the same temperature regardless of the size of the sample. The density of the sample changes with temperature and pressure. for example : The density of a substance increases with a decrease in temperature as the volume increases.
Hence, the statement about density is not true is " d. The density of a substance is always the same, regardless of temperature."
Explanation:
Below is an attachment containing the solution.
Find moles of MgCl first by dividing by the molar mass.
21.9 g / 95.211 g/mol = 0.230 mol MgCl
Then divide by L of water to get the molarity.
0.230 mol / 0.750 L = 0.307 M MgCl
