You need to make a 500 mL of 5M NaCl solution. How many grams of NaCl do you need? please i need help i need this to pass a quiz to graduate high school

Answer 1

First, let's figure out how many moles of NaCl are in 500 mL of a 5M solution. 5M solution has 5 moles per liter, but you only have 500 mL (1/2 liter), so you only need 2.5 moles of NaCl.

Now we need to find out how many grams are in 2.5 moles. For this we need the formula mass of NaCl.

The periodic table gives a value of about 58.5 g/ mole. To determine how many grams in 2.5 moles,

multiply 58.5 g/mole x 2.5 moles to get 146.3 grams of NaCl.