Qual è la formula del pentossido di dinitrogeno?
Risposta:
#N_2O_5"#
Spiegazione:
Lets have a look at the words involved:
#di#nitrogen and #pent#oxide.
The #di# e #pent# are common prefixes to words which signify numbers, but which numbers? Have a look at this table, and you will find that in this case they signify 2 and 5 respectively.
Using this knowledge (note that "penta" has the "a" removed for words starting with a vowel like "oxide"), it is possible to say that there are 2 nitrogen's and 5 oxygen's in this chemical equation, thus #N ""_2O""_5"#
Hope that Helped!
https://www.slideshare.net/mlacoursiere/c20-review-unit-01-matter-energy-and-the-periodic-table