We can use the formula:
$C_1V_1 = C_2V_2$
Where $C_1$ is the initial concentration, $V_1$ is the initial volume, $C_2$ is the final concentration, and $V_2$ is the final volume.
For the first dilution, we have:
$C_1 = 1.50\,\text{M}$, $V_1 = 78.0\,\text{mL}$,
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