Question

A shipment of fish was was destroyed after it was found to contain

1.76 ppm of Hg. The legal limit for Hg in fish is 1.00 ppm. IF the fish

meat had a total mass of 12.5 kg, what mass of Hg was in the fish?

Answer 1

We are not provided with the molar mass of the fish molecules so lets assume it as x

moles of fish molecules in 12.5 kg of fish meat = $12.5\times10^3/x$

molecules contained in the 12.5 kg of meat = $\frac{12.5\times10^3}{x}\N_A$

It is said in the question that 1.76 parts per million is mercury

So mercury molecules present =$\frac{12.5\times10^3}{x}\N_A\times10^{-7}\times1.76$

If we divide it by N_A we will get number of moles of mercury and if we will further multiply it by the molar mass of the mercury we will get the mass of mercury present

Since you have not provided the all data we are unable to tell you the answer