Final answer:
To find the molarity, divide 5 grams of NaCl by its molar mass (58.44 g/mol) to get the number of moles, and then divide by the volume in liters (0.1 L). The solution's molarity is 0.855 M.
Step-by-step explanation:
To calculate the molarity of a solution where 5 grams of NaCl is dissolved in 100 mL of water, we need to convert grams to moles and milliliters to liters. Since the molar mass of NaCl is 58.44 g/mol, we divide the mass of NaCl by its molar mass to find the number of moles.
Here is the calculation:
Number of moles of NaCl = 5 g ÷ 58.44 g/mol = 0.0855 mol.
Now, to find molarity, we divide the moles of solute by the volume of solution in liters.
Molarity (M) = Number of moles of NaCl ÷ Volume of solution in liters = 0.0855 mol ÷ 0.1 L = 0.855 M.
Therefore, the solution's molarity is 0.855 M.