Convert 25 g KCl into moles.
Understand the Problem
The question is asking to convert a mass of 25 grams of potassium chloride (KCl) into moles, requiring the application of the molar mass of KCl for the conversion.
Answer
$0.335$ moles
Answer for screen readers
The number of moles of KCl in 25 grams is approximately $0.335$ moles.
Steps to Solve
- Determine the molar mass of KCl
First, calculate the molar mass of potassium chloride (KCl). The molar mass is calculated by adding the atomic masses of potassium (K) and chlorine (Cl).
- Potassium (K): approximately 39.10 g/mol
- Chlorine (Cl): approximately 35.45 g/mol
Thus, the molar mass of KCl is: $$ \text{Molar mass of KCl} = 39.10, \text{g/mol} + 35.45, \text{g/mol} = 74.55 , \text{g/mol} $$
- Use the formula to convert grams to moles
Next, use the formula to convert grams of KCl to moles: $$ \text{Moles} = \frac{\text{Mass (g)}}{\text{Molar mass (g/mol)}} $$
For this problem, the mass of KCl is 25 g, and the molar mass we calculated is 74.55 g/mol.
- Calculate the number of moles
Substituting the values into the formula: $$ \text{Moles} = \frac{25, \text{g}}{74.55, \text{g/mol}} \approx 0.335, \text{moles} $$
The number of moles of KCl in 25 grams is approximately $0.335$ moles.
More Information
Potassium chloride (KCl) is commonly used in food processing, pharmaceuticals, and as a potassium supplement. Understanding how to convert grams to moles helps in stoichiometric calculations in chemistry.
Tips
- Forgetting to use the correct units for molar mass (g/mol).
- Using incorrect atomic masses for elements leading to wrong molar mass calculations.
- Not properly converting grams to moles by incorrectly applying the formula.
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