What is molecule cells need ? Like what I’m trying to say is that what is it mostly talking about ?

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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.

How would the number of moles (n) of o2 change if the atmospheric pressure doubled but all other variables stayed the same

How are isotopes of the same chemical element alike? how are they different?