Respuesta :

Answer:

30 moles of ethanol are needed to prepare a 25 m solution, using 1200 g of water

Explanation:

This a short problem of solutions:

Our solute is ethanol: C₂H₅OH

Our solvent is water-

25 m, is our solution's concentration. m means molality (moles of solute contained in 1kg of solvent).

Our solvent mass is 1200g. We convert them to kg

1200 g . 1kg / 1000g = 1.2 kg

m = mol/kg → mol = m . kg

mol = 25 mol/kg . 1.2kg →30 moles