In video science compared to a tapestry explain what is meant by this comparison

The covalent compound acetylene, which is the fuel of the oxyacetylene torch used by welders, has the molecular formula c2h2. the covalent compound benzene, a commercial solvent, has the molecular formula c6h6 each of these covalent compounds contains carbon and hydrogen atoms in a one-to-one ratio. would it be correct to write the chemical formulas of each as ch? explain.

0.09 moles of sodium sulfate in 12 ml of solution

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