20. Express in moles: a) 6.02∙1024 methane molecules; b) 1.8∙1028 chlorine atoms; c) 3.01∙1023 molecules of carbon dioxide; d) 30.1∙1025 phosphine molecules; e) 19.6 g of sulfuric acid.
If the file does not open for you, install the Rar archiver program. Inside the archive, the solution is in WORD format.