Explanation:
We are given: volume = 1.5 L
: concentration = 0.28 M
To find the number of moles, we use:
C = n/V
Where: C is concentration, n is number of moles, and V is volume
After rearranging:
n = CV
n = 0.28 * 1.5
n = 0.42 mol
Therefore, for a 1:1 reaction:
n of solute = 0.42 mol