Which one is it (it’s multiple choice too) a. gases have a definite volume and a definite mass.

b. gases hold the shape of their container and feel firm to touch.

c. gases spread out most and take up any available space.

d. gases do not spread out and they do not take up space.

this is a question from my edpuzzle any help will do <3

(the subject is science but since that’s not an option chemistry is the closest)

One way in which the useful metal copper is produced is by dissolving the mineral azurite, which contains copper(ii) carbonate, in concentrated sulfuric acid. the sulfuric acid reacts with the copper(ii) carbonate to produce a blue solution of copper(ii) sulfate. scrap iron is then added to this solution, and pure copper metal precipitates out because of the following chemical reaction: (s) (aq) (s) (aq) suppose an industrial quality-control chemist analyzes a sample from a copper processing plant in the following way. he adds powdered iron to a copper(ii) sulfate sample from the plant until no more copper will precipitate. he then washes, dries, and weighs the precipitate, and finds that it has a mass of .