Final answer:
To calculate the mass of NaCl in 60.0 mL of a 10.0% w/v solution, we multiply 10.0 g by 60.0 mL and divide by 100 mL, yielding 6.0 grams of NaCl.
Step-by-step explanation:
To find the mass of NaCl in a 10.0% w/v solution, we will apply the definition of percent concentration. A 10.0% w/v solution means that there are 10.0 grams of NaCl in every 100 mL of solution. Thus, for 60.0 mL of solution, we can set up a proportion: If 100 mL contains 10.0 g of NaCl, then 60.0 mL will contain X g of NaCl.
To calculate X, which is the mass of NaCl, we use the proportion 10.0 g/100 mL = X g/60.0 mL. Solving for X gives us:
X = (10.0 g × 60.0 mL) / 100 mL
X = 6.0 g
Thus, the mass of NaCl in 60.0 mL of a 10.0% w/v solution is 6.0 grams.