Answer
0.174 M
Work Step by Step
Molarity=$ \frac{Number\,of\,moles\,of\,K_{2}CrO_{4}}{Volume\, of\, solution\,in\,L}=\frac{\frac{Mass\,of\,K_{2}CrO_{4}}{Molar\,mass}}{Volume\,of\, solution\,in\,L}$
$=\frac{\frac{5.08g}{194.19g/mol}}{0.150L}=0.174\,M$