Answer:

Explanation:
Hello,
In this case, the unit of concentration is molality which is defined by:

Whereas the mass of the solvent is measured in kilograms. In such a way, with the given data, we first compute the kilograms of water:

Then, we solve for the moles of the solute:

Finally since the molar mass of ethanol is 46 g/mol, we compute the grams for the given solution:

Best regards.
K(+1)
Mn(x)
O(-2)
1+x-2*4=0
x=7