If you have 300 mL of a 15% potassium chloride (KCI) solution, how many grams of KCI are present?

To determine how many grams of potassium chloride (KCl) are in 300 mL of a 15% KCl solution, follow these steps:

1. **Understand the percentage concentration**: A 15% KCl solution means there are 15 grams of KCl in every 100 mL of solution.

2. **Set up a proportion to find the amount in 300 mL**:
   
   \[
   \frac{15 \text{ grams}}{100 \text{ mL}} = x \text{ grams in 300 mL}
   \]

3. **Solve for \( x \)**: 

   \[
   x = \left( \frac{15 \text{ grams}}{100 \text{ mL}} \right) \times 300 \text{ mL}
   \]

4. **Calculate the result**:

   \[
   x = 45 \text{ grams}
   \]

So, there are **45 grams of KCl** in 300 mL of a 15% KCl solution.

Would you like more details or have any questions about this calculation? Here are some related questions for further exploration:

1. How many grams of KCl are in 500 mL of a 10% KCl solution?
2. What volume of a 20% KCl solution contains 50 grams of KCl?
3. How do you prepare 250 mL of a 5% KCl solution from a 25% KCl stock solution?
4. What is the KCl concentration in a solution containing 30 grams of KCl in 150 mL?
5. How would you dilute a 30% KCl solution to obtain 1000 mL of a 15% solution?
6. If a solution has 60 grams of KCl in 400 mL, what is the percentage concentration?
7. How many milliliters of a 15% KCl solution are needed to obtain 30 grams of KCl?
8. What is the mass of KCl in 1 liter of a 12% KCl solution?

**Tip:** When working with solutions, always ensure that the units of measurement are consistent to avoid errors in calculations.

Learn how to calculate the grams of potassium chloride (KCl) in 300 mL of a 15% KCl solution with a step-by-step solution. Understand the percentage concentration and use a proportion to find the amount of KCl. Suitable for students in Grades 7-9.

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