# How many moles of nacl are required to make 250 ml of a 3.00 M solution?

3.00 M, or 3 moles per (L) "liter" calls for having 3 moles per liter of the solution.

The question asks how many moles must be in 250ml of a solution that has 3 moles per Liter.

You must ask yourself what percent of 1 Liter is 250mls? Since there are a thousand ml in one liter, (1000ml=1L), then 250ml is exactly 25% of a Liter, or .25L.

So, 250ml can only hold 25% of the 3.00 Molarity. Meaning that you multiply 3 x .25 and get .75 moles.

### How many moles of NaOH are required to prepare 5.00 L of 0.025 M Solution?

Concentration of NaOH = 0.025 M = 0.025 Moles per Litre of Solution Volume of Solution required = 5.00L We can say therefore that: Number of Moles of NaOH needed to prepare the solution = Concentration of NaOH * Volume of Solution required Therefore: Number of Moles of NaOH needed to prepare the solution = 0.025M * 5.00L = 0.125moles From this we can say that 0.125 moles of NaOH are needed to prepare a…

### How many grams of solute are required to make a 918 mL solution of sodium hydroxide with a concentration of 0.4922 M?

Molarity = moles of solute/Liters of solution ( 918 ml = 0.918 liters ) rearranged algebraically, moles of solute = Liters of solution * Molarity moles of NaOH = (0.918 l)(0.4922 M) = 0.45184 moles NaOH =======================so, 0.45184 moles NaOH (39.998 grams/1 mole NaOH) = 18.1 grams sodium hydroxide needed ============================