Answer:
10.34 mL
Step-by-step explanation:
The molar mass of K2S is 110.26g/mol.
Number of moles of K2S = mass / molar mass
Number of moles of K2S = 28.5g / 110.26g/mol = 0.2586 mol
Now, we can use the definition of molarity to calculate the volume of the solution that can be prepared.
Molarity = number of moles / volume of solution (in liters)
Rearranging the equation, we get:
Volume of solution = number of moles / molarity
Volume of solution = 0.2586 mol / 25 mol/L = 0.010344 L = 10.34 mL
Therefore, 10.34 mL of a 25M solution of K2S can be prepared from 28.5g of K2S.