Questions: A chemist determined by measurements that 0.010 moles of potassium participated in a chemical reaction. Calculate the mass of potassium that participated in the chemical reaction. Be sure your answer has the correct number of significant digits.

Solution Steps

The molar mass of potassium (K) is approximately 39.10 g/mol.

The mass of a substance can be calculated using the formula: \[ \text{mass} = \text{moles} \times \text{molar mass} \] Given that the number of moles of potassium is 0.010 moles, we can substitute the values into the formula: \[ \text{mass} = 0.010 \, \text{moles} \times 39.10 \, \text{g/mol} \]

\[ \text{mass} = 0.010 \times 39.10 = 0.3910 \, \text{g} \]

Final Answer