**Answer: D=4.35g/L**

**Explanation:**

The formula for density is . M is mass in grams and V is volume in liters.

Since we are give pressure and temperature, we can use the ideal gas law to find moles/volume. FInding moles/volume would give us the base for density. All we would have to do is convert moles to grams.

**Ideal Gas Law: PV=nRT**

Now that we have moles, we can use molar mass of chlorine gas to find grams.

With our grams, we can find our density.

We need correct significant figures so our density is:

**Molarity (M) = moles of the solute (mol) / Volume of the solution (L)**

The molarity of the given KCl solution = 2.10 M

Volume of the given KCl solution = 85.0 mL

Hence,

2.10 M = Moles of KCl / 85.0 x 10⁻³ L

Moles of KCl = 2.10 M x 85.0 x 10⁻³ L

= 0.1785 mol

**Moles (mol) = Mass (g) / Molar mass (g mol⁻¹)**

Molar mass of KCl = 74.56 g mol⁻¹

Hence,

0.1785 mol = Mass of KCl / 74.56 g mol⁻¹

Mass of KCl = 0.1785 mol x 74.56 g mol⁻¹

= 13.30 g

**Hence, mass of given KCl in 85.0 mL is 13.30 g.**

Weak acids ionise partially and their ionisation is reversible and the ions may react to give back the acid molecule (sorry i'm not sure if i am answering your question though)

**Answer:**

The innermost electron shell of an atom can hold up to _____ electrons. ... What determines the types of chemical reactions that an atom participates in? the number of electrons in the outermost electron shell. Atoms with the same number of protons but with different electrical charges

Answer: 94.07%

Explanation:

Percentage yield can be calculated by the formula

%yield = Experimental yield/Theoretical yield x100

Experimental yield = 7.93g

Theoretical yield = 8.43

%yield = Experimental yield/Theoretical yield x100

%yield = 7.93/8.43 x 100 = 94.07%