How many electrons would be represented in the lewis dot notation for an atom of oxygen? a,2.b.6.c.8.d.18

Achef makes salad dressing by mixing oil, vinegar, and spices, as shown. which type of matter is the salad dressing?

What is the number of moles of chemical units represented by 9.03x10^24? and how do i show work? (dumb it down )

Ammonium perchlorate nh4clo4 is the solid rocket fuel used by the u. s. space shuttle. it reacts with itself to produce nitrogen gas n2 , chlorine gas cl2 , oxygen gas o2 , water h2o , and a great deal of energy. what mass of nitrogen gas is produced by the reaction of 2.1g of ammonium perchlorate?