Respuesta :

Answer:

Explanation:

250ml=0.25 liter

0.50M means there is 0.50 mole of NaCl for every 1 liter of solvent.

If so, I need (0.25*0.50) mole of NaCl to make 0.50M soln

0.25*0.50=0.125mole

number of mole= given mass/formula mass, therefore for Nacl:

0.125=X/58.44

x=7.305

you need 7.305 gram of NaCl

mickymike92

The mass of NaCl required is 7.31 g

What is the mass in grams of NaCl required to prepare 250ml of a 0.50 M ?

The mass of NaCl required is obtained from the molarity and volume of the solution as follows:

  • Molarity = number of moles/volume(in Liters)

Number of moles of NaCl present in 250ml of a 0.50 M wil be:

Number of moles = molarity * volume

volume of solution = 250 mL = 0.25 L

Number of moles = 0.25 * 0.5

Number of moles = 0.125 moles

  • Number of moles = mass/ molar mass

mass = number of moles * molar mass

Molar mass of NaCl = 58.5 g/mol

mass = 0.125 * 58.5

Mass = 7.31 g

Learn more about mass, molar mass and moles at: https://brainly.com/question/21334167

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