During the course of an experiment, a 0.300 M NaCl solution with an initial volume of 25.0 ml is diluted to a total final volume of 26.0 ml. What is the concentration of NaCl in the final solution?
Do I use M1V1=M2V2 ?
If it takes 10.0 minutes for 5000 atoms of a radioactive isotope to decay to 2500 atoms, how many of the original 5000 atoms remain after 30.0 minutes?