What is the mole ratio of Hg/O2
i need help with this test please help!!!

2:1

Explanation: Notice that mercury(II) oxide decomposes to form liquid mercury and oxygen gas in a 2:1 mole ratios.

if you mean hydrogen and oxygen then water is the product

shield volcanos are angry and get mad over the smallest things so much that there heads erupt   pahoehoe and a'a lava. a composite volcano is the poller opposite of a shield volcano. its   peaceful thing and knows how to control its emotions.