25.00 g of aluminum sulfide and 50.00 g of water react until the limiting reagent is used up:

Al2S3 + 6H2O → 2Al(OH)3 + 3H2S

a) Which is the limiting reagent?
b) What is the maximum mass of hydrogen sulfide that can form?

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

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 a for sure mark brainliest i had got this right on usatestprep