a ballon is filled with 2.5 L of helium gas at STP. how many moles of helium are contained in the balloon?

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

Draw the lewis dot structure for each of the following polyatomic ions

How many moles of oxygen react with 12 moles of aluminum