To determine how many moles are in 150 grams of sodium chloride (NaCl), we first need to know the molar mass of NaCl. The molar mass of sodium (Na) is approximately 23 grams/mol, and the molar mass of chlorine (Cl) is approximately 35.5 grams/mol. Therefore, the molar mass of NaCl is:
23 g/mol (Na) + 35.5 g/mol (Cl) = 58.5 g/mol (NaCl)
Now, to find the number of moles in 150 grams of NaCl, we use the formula:
Number of moles = mass (g) / molar mass (g/mol)
Substituting the values we have:
Number of moles = 150 g / 58.5 g/mol ≈ 2.56 moles
So, the answer falls closest to option (d) 2.5 moles when rounded. Therefore, 150 grams of NaCl is approximately equal to 2.5 moles.