What is the mass of 0.61 mol of sodium chloride (NaCl)?

The molar mass of sodium chloride is the sum of the molar mass/amu of the elements sodium (Na) and chlorine (Cl), which are the atomic weights on a periodic table. The molar mass of sodium is 22.99 g/mol and the molar mass of chlorine is 35.45 g/mol, as seen on the periodic table. Molar mass of NaCl = 22.99 g/mol + 35.45 g/mol = 58.44 g/mol. Use dimensional analysis to convert from moles to mass. Since we are given moles and want to find grams, keep the molar mass in terms of g/mol. 0.61 mol NaCl * 58.44 g/mol = 35.6484 g. Since 0.61 mol has two significant figures, the mass of sodium chloride is just 36 g.

You use the atomic number to find out how many protons and neutrons there are in the atom. you use the atomic mass to find out how many protons and electrons there are in the atom. 

Your awser would be a acetone