3) A 4.0 L sample of CO 2 is reduced to a volume of 2.7L , increasing the pressure to 78.5 kPa . What was the original (old ) pressure if there was no temperature change ?

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

Asample of tin (ii) chloride has a mass of 0.49 g. after heating, it has a mass of 0.41 g.  what is the percent by mass of water in the hydrate?   %

Describe at least two advantages and two disadvantages of using hydropower as a source of energy.