Answer:
H2O2
Explanation:
2 hydrogen, 2 oxygen wikipedia it
C. A magnet causing a metal object to move
Answer:
The partial pressure of
when the valve is opened is 328.6 Torr.
Explanation:
Initial pressure of the 
Initial volume of the 
After opening the valve :
Final pressure or partail pressure of the 
Final volume of the 
( Boyle's law)

The partial pressure of
when the valve is opened is 328.6 Torr.
Sample A dissolves most slowly because it tells us, first off, that A dissolves slower than B. It also tells that B dissolves more slowly than C. This means that’s A is slower than B and C, because there is no way A would be faster than C if B is already slower (because A is slower than B.) I hope this helps. :)