The atmosphere exerts a force on Earth. If there is less air mass in a given volume, which of the following will also decrease? plese help fast it is due soon

Used the balanced equation 2h2+ o2 - -> 2h2o. if you have 7.2 grams of o2 , how many grams of h2o can you produce ?

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.

Which statement is true about this reaction? 14n+1h 15o it is a practical source of energy on earth. it occurs only outside the solar system. its product is heavier than each of its reactants. it shows the critical mass of an element.