Mass Number — Definition & Overview

The conversion factor between unified atomic mass units and grams is known as a mole, and is equal to Avogadro's number ($1 mol=N_{A}\approx 6.022 \cdot 10^{23}$). What this means is that in order to have a gram of protons (1 proton is 1 unified atomic mass units), we need 1 mole of protons. How many grams do we need to have 1 mole of carbon-12?