What is the mass in grams of 0.0135 of the element sodium Na?

To find the mass in grams of 0.0135 moles of sodium (Na), you can use the molar mass of sodium, which is approximately 22.99 g/mol. Multiply the number of moles by the molar mass: 0.0135 moles × 22.99 g/mol = 0.3104 grams. Therefore, the mass is approximately 0.31 grams.