Joseph priestley is credited with the discovery of oxygen. he pro- duced o2 by heating mercury(ii) oxide, hgo, to decompose it into its elements. how many moles of oxygen could priestley have pro- duced if he had decomposed 517.84 g of mercury oxide?

1.2 moles

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

According to stoichiometry:

2 moles of gives 1 mole of

Thus 2.4 moles of will give= of

Thus 1.2 moles of oxygen are produced.

a saline water is fed to a reverse osmosis unit at flow rate o rotameter connected to reject (retentate) line reads 8 installed in reject and permeate line reads 15.2 milli siemens/cm and 300 micro siemens/com respectively.

the answer is option a.