Final answer:
The mass of 0.0135 mol of sodium (Na) is 0.310 g.
Step-by-step explanation:
The mass in grams of 0.0135 mol of the element sodium (Na) can be calculated using the molar mass of sodium. The molar mass of sodium is 22.99 g/mol. To calculate the mass, you multiply the number of moles by the molar mass:
Mass (g) = Number of moles x Molar mass
So, the mass of 0.0135 mol of sodium is:
Mass (g) = 0.0135 mol x 22.99 g/mol = 0.310 g