What is the number of g of NaCl in 500 ml of a 10% (w/v) solution?

1. 5%

2. 10%

3. 50%

4. 1%

5. 15%

To calculate the number of grams (g) of NaCl in a 10% (w/v) solution, you need to know the density of the solution and the volume (ml) of the solution. The percentage 10% (w/v) indicates that there are 10 grams of NaCl per 100 ml of solution.

Given that you have 500 ml of the solution, you can use the concept of proportionality to find the number of grams of NaCl.

First, calculate the number of grams of NaCl per 100 ml of solution:
10 g NaCl / 100 ml solution = x g NaCl / 500 ml solution

Cross-multiply and solve for x:
(10 g NaCl) * (500 ml solution) = (100 ml solution) * (x g NaCl)

x = (10 g NaCl * 500 ml solution) / 100 ml solution

x = 50 g NaCl

Therefore, the number of grams (g) of NaCl in 500 ml of a 10% (w/v) solution is 50 g.

None of the provided options match the correct answer.