Who dose like math and who does not like math and tell me why

How many moles of na2s2o3 are needed to react with 0.12mol of cl2? show work.

A1.50-liter sample of dry air in a cylinder exerts a pressure of 3.00 atmospheres at a temperature of 25°c. without changing the temperature, a piston is moved in the cylinder until the pressure in the cylinder is reduced to 1.00 atmospheres. the volume of the gas is

Which heterogeneous mixture contains large particles that can settle out or can be filtered? colloid compound element suspension