A 1.0 M solution of NaCl has a final concentration of 0.20 M and a final volume of 200 mL, what was the initial volume of the NaCl solution in mL?

> b takes place in the gas phase in an isothermal tubular reactor. the feed is one mole of a per one mole of c, an inert. the entering temperature and pressure are 427°c and 10 atm, respectively. the gas constant r = 0.08206 atm · l/mol · k.