How many moles are in 25 liters of MgS?

Answer 1

To answer this question you would need a conversion factor between moles and liters (volume).

This could be molar volume (given in Moles/Liter for example)

Another route would be to use the density of MgS (g/mL)

Finally, you need to determine the molar mass of MgS. This is equal to mass of Mg + S from periodic table = (24.305 + 32.065) = 56.38 g/mol

For example, let's assume MgS has a density of 5 g/mL (it doesn't, but just using easy numbers)

25 L MgS x 1000mL MgS x 5 g MgS x 1 mole MgS = 2,217 moles of MgS (ignoring sig figs)

1 L MgS 1mL MgS 56.38 g MgS

note dimensional analysis below

25 L MgS x 1000 mL MgS x 5 g MgS x 1 mole MgS = 2,217 moles of MgS (ignoring sig figs)

1 L MgS 1mL MgS 56.38 g MgS