Calculate the current that must be passed into a solution of aluminum salt for 2hrs in order to deposit 2.5g of aluminum? An example of insoluble chloride im water is: SO₂ can be used as: If the mass number of X is 24 and X²+ contains 10 electrons, the nucleus will consist of

• Mass of aluminum ($m$) = $2.5 \, \text{g}$
• Time ($t$) = $2 \, \text{hrs}$
• Molar mass of aluminum ($M$) = $26.98 \, \text{g/mol}$ (approximately $27 \, \text{g/mol}$)
• Charge of aluminum ion ($z$) = 3 (since aluminum forms $\text{Al}^{3+}$)
• Faraday's constant ($F$) = $96485 \, \text{C/mol}$

The formula is $m = \frac{ItM}{zF}$. Rearrange to solve for $I$:

Substitute the values:

The current required is $\boxed{\text{3.73 A}}$.

2. An example of insoluble chloride in water is:

An example of an insoluble chloride in water is silver chloride ($\text{AgCl}$). Other examples include lead(II) chloride ($\text{PbCl}_2$) and mercury(I) chloride ($\text{Hg}_2\text{Cl}_2$).

3. SO₂ can be used as:

$\text{SO}_2$ (sulfur dioxide) can be used as a preservative (e.g., in wines and dried fruits) and as a bleaching agent (e.g., for wool and silk).

4. If the mass number of X is 24 and X²⁺ contains 10 electrons, the nucleus will consist of:

• The ion $\text{X}^{2+}$ has 10 electrons.
• Since it has a $+2$ charge, it has lost 2 electrons.
• Therefore, the neutral atom X must have had $10 + 2 = 12$ electrons.
• In a neutral atom, the number of electrons equals the number of protons. So, the number of protons in X is 12.

• The mass number (A) is given as 24.
• The mass number is the sum of protons (Z) and neutrons (N): $A = Z + N$.
• We found the number of protons (Z) to be 12.

The nucleus of X will consist of $\boxed{\text{12 protons and 12 neutrons}}$.