Calculate the number of moles of sulfuric acid that is contained in 0.250 mL of 0.500 M sulfuric acid solution.

0.000125 moles

Explanation:

Firstly, we need to know the meaning of the 0.5M. This simply means 0.5 moles are present in 1L or 1dm^3. 0.5M could also be written as 0.5moles/L.

Now, we know that there are 0.5 moles in 1L, we now need to calculate the number of moles in 0.5ml.

It is necessary to know that 1000ml = 1L.

Now if 0.5 moles = 1000ml

xmoles = 0.25ml

X = (0.25 * 0.5) / 1000 = 0.000125 moles