Question

In research, it has been found that millions of bottled mineral water contain benzene (C₆H₆) at morality levels higher than concentrations considered lethal for rats. A sample of 250 mL mineral water has a concentration of 0.000151 M. What is the mass of benzene in the sample? Show your solutions

Answer 1

number of moles =concentration$\times$ volume$=0.000151\times 250/1000=3.775\times10^{-5}moles$

$C=12, H=1$

$RMM=12\times6+6\times 1=78$

$mass=RMM\times number\space of\space moles=78\times3.775\times10^{-5}=2.9445\times 10^{-3}g$