No; the petroleum industry (exploration, extraction, refining and distribution) only.
The State, by means of the government-owned "Petroleos Mexicanos - PEMEX" company.
No.
Petroleos Mexicanos (Pemex).
No; by law the only gas and diesel distributor in Mexico is the government-owned company, Petroleos Mexicanos (PEMEX).
Just one: Petroleos Mexicanos (Pemex).
I guess you mean natural gas; unlike oil, natural gas is only extracted by Pemex but it is distributed by private companies. It means if you have a company that sells gas, yes you can. However, to prevent explosions due to unsafe gas storage practices, as a private citizen you can't distribute and/or sell gas to third parties. If you mean gas as 'gasoline' no you can't. Extraction and distribution of liquid fuels such as gasoline and diesel are reserved for Pemex only and are prohibited by law.
Government-owned Pemex qualifies as such, both in terms of revenue and number of employees.
In short, it is providing the legal framework needed so that private investors can invest on the Mexican oil industry, which nowadays, is almost exclusive to the state-owned oil company, Petroleos Mexicanos (Pemex).
Yes, there are Pemex stations in Ciudad Acuña that sell diesel. You can find these stations throughout the city, as Pemex is a major fuel provider in Mexico. It's always a good idea to check for the nearest location and confirm availability, as offerings may vary.
You mean individual corporation? That would be Pemex (oil) followed by America Movil (telecommunications) and Walmart de Mexico (retail).
PEMEX significa PEtroleos MEXicanos.
Pemex is PETROLEO MEXICANO and in English is MEXICAN OIL