Pb(OH)2 + 2 HCI RRR 2 H20 + PbCl2 13.5g
+ X
OBY
How many grams of 2 HCL must there be to observe the law of conservation of mass?
12.5g
O 13.5
O 179
O 18g

What is important to study for nios grade 12 chemistry? i have only one month left.

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

Avariable that is not being directly tested during an experiment should be changed varied experimented controlled