How do you count sigma and pi bonds?

Nuclear fusion is the source of energy for stars. besides hydrogen, which other element is most likely also common in stars?

Use the gizmo to find the concentration of the mystery ch3cooh. use the titrant and indicator shown below perform the titration. what is the titrant volume? titrant analyte indicator titrant volume analyte concentration naoh ch3cooh phenophthalein select one: a. 20.0 ml b. 27.0 ml c. 30.0 ml d. 24.0 ml

At 450 mm hg a gas has a volume of 760 l, what is its volume at standard pressure