what net charge would you place on a 120.85 g piece of sulfur if you put an extra election on 1*10^12 of its atoms

What volume of a 2.00 m stock solution of naoh is needed to prepare 150. ml of 0.40 m solution?

Agas at 155 kpa and standard temperature has an initial volume of 1.00 l. the pressure of the gas rises to 500 kpa as the temperature also rises to 135°c. what is the new volume? 2.16 l 0.463 l 0.207 l 4.82 l

How many moles of magnesium is 3.01 x10^22 atoms of magnesium?