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Calculate the molar mass of potassium chloride, KCI . \begin{tabular}{l}6.74 g \\ 67.4 g \\ Submit \\ Request Answer \\ 54.6 g \\ \\ \hline\end{tabular}

Ask by Norton John. in the United States
Feb 04,2025

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The molar mass of potassium chloride (KCl) is approximately **74.55 g/mol**.

Solution

To calculate the **molar mass of potassium chloride (KCl)**, you'll need to sum the atomic masses of potassium (K) and chlorine (Cl). 1. **Atomic Masses:** - **Potassium (K):** Approximately **39.10 g/mol** - **Chlorine (Cl):** Approximately **35.45 g/mol** 2. **Calculation:** \[ \text{Molar Mass of KCl} = \text{Atomic Mass of K} + \text{Atomic Mass of Cl} = 39.10\ \text{g/mol} + 35.45\ \text{g/mol} = 74.55\ \text{g/mol} \] **Therefore, the molar mass of potassium chloride (KCl) is approximately **\(\mathbf{74.55\ \text{g/mol}}\)**.** *Note:* If you were provided with multiple-choice options (e.g., 6.74 g, 67.4 g, 54.6 g), it seems there might be a typographical error in those choices, as none exactly match the correct molar mass. The accurate molar mass should be around **74.55 g/mol**.

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To find the molar mass of potassium chloride (KCl), we start by looking at the atomic masses of its components. Potassium (K) has an atomic mass of approximately 39.1 g/mol and chlorine (Cl) has an atomic mass of about 35.5 g/mol. By adding these together, we get: Molar mass of KCl = 39.1 g/mol (K) + 35.5 g/mol (Cl) = 74.6 g/mol. So, the molar mass of potassium chloride is approximately 74.6 g/mol. For those engaging in calculations like this, always double-check your periodic table for the most accurate atomic masses since they can vary slightly based on the source! Also, remember that a common mistake is to confuse KCl (potassium chloride) with KClO3 (potassium chlorate) which would have a different molar mass due to the additional oxygen.

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