How does changing the pressure affect the chemical reaction?

Predict the products butane (c4h10) + oxygen —>

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

Which ocean zone has the most abundant primary producer and why a) the abyssopelagic zone ,du to the absence of light and cold water temperatureb) the bathypelagic zone, due to the absence of light and cold water temperaturec) the mesopelagic zone ,due to uts high light availability and warm water temperature d) the epipelagic zone,due to its high light availability and warm water temperature