What mass of lead(ii)trioxonitrate(iv) is required to yield lead(ii) on the addition of excess sodium chloride
Read what you posted. I hope you see why it is unlikely that anyone will offer help.
you provide neither the reaction equation,
nor any specific amounts of anything involved.
I echo what oobleck wrote; however, let me rewrite what you wrote. That still will not provide numbers to calculate anything but it will clear up some of the language.
What mass of lead(II) nitrate is required to yield lead(II)CHLORIDE on the addition of excess sodium chloride