A container holds 20.4 L of CO2 at 1.58 atm, what is the volume at STP?

32.232 L

Explanation:

-Given the volume at 1.58atm is 20.4 L

-At standard pressure, the pressure is 1.00atm

-We apply Charle's Law to find the volume at STP:

Hence, the volume of the gas at STP is 32.232 L

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.