To determine how many moles are in 150 grams of NaCl (sodium chloride), we need to use the concept of molar mass. The molar mass of a substance is the mass of one mole of that substance. For NaCl, the molar mass is calculated by adding the atomic masses of sodium (Na) and chlorine (Cl).
The atomic mass of sodium (Na) is approximately 22.99 g/mol, and the atomic mass of chlorine (Cl) is approximately 35.45 g/mol. Therefore, the molar mass of NaCl is:
22.99 g/mol (Na) + 35.45 g/mol (Cl) = 58.44 g/mol
Now, to find the number of moles in 150 grams of NaCl, we use the formula:
Number of moles = Mass of substance (g) / Molar mass (g/mol)
Plugging in the values:
Number of moles = 150 g / 58.44 g/mol ≈ 2.57 moles
So, there are approximately 2.57 moles in 150 grams of NaCl.