Please note that you may purchase the print edition of The ACS Style Guide from Oxford University Press; please see the following link: http://global.oup.com/academic/product/the-acs-style-guide-9780841239999?cc=us&lang=en&promocode=25534
However, if you choose to access a free online ACS Style Guide, you will need to register for a free ACS ChemWorx account. To register for ACS ChemWorx you need the ACS ID. If you do not have ACS ID please register at ACS Publications site. Registering is free of charge and can be performed on this web page:
Once you have registered for an ACS ChemWorx account, please follow these steps:
Login to ACS ChemWorx.
Click Publishing Center: https://pc.acschemworx.acs.org/platinum/DashBoard
A new window will appear and look for “ACS Style Guide” then select the plus “+” sign.
You may now download the PDF ACS Style Guide online.