Answer:
0.0085 moles
Step-by-step explanation:
To determine the number of moles of NaCl in 0.5 g, you need to divide the mass by the molar mass of NaCl. The molar mass of NaCl is the sum of the atomic masses of its constituent elements, which are sodium (Na) and chlorine (Cl).
The atomic masses of Na and Cl are 22.99 g/mol and 35.45 g/mol, respectively. The molar mass of NaCl is therefore:
Na = 22.99 g/mol
Cl = 35.45 g/mol
NaCl = Na + Cl = 22.99 g/mol + 35.45 g/mol = 58.44 g/mol
To calculate the number of moles of NaCl in 0.5 g, we use the formula:
moles = mass / molar mass
Substituting the values, we get:
moles = 0.5 g / 58.44 g/mol ≈ 0.0085 mol
Therefore, 0.5 g of NaCl is equivalent to approximately 0.0085 moles of NaCl.