-A student would like to prepare 250 mL of 0.25 mol L lead(II) nitrate, solution.
Calculate the mass of lead(II) nitrate required to prepare the solution.

20.68

Am I right??

I solved it but exactly i donot know I think eq. wt of lead nitrate is 331

he uptake of drugs from the intestine is often strongly influenced by diffusion. for example, consider a water-insoluble steroid for treating inflammation that is solubilized in aggregates of detergent molecules, called micelles. these micelles, aggregates of 80 soap molecules, have a molecular weight of 24,000, a diameter of 2.6 nm, and a charge of -27. the positively charge ions (counterions) in this system are na".