When students added 2.0g NaI crystals to 100.ml of Pb(NO3)2(aq), a yellow peevipitae is formed. after the solution was filtered, the yellow solid was dried and weighed. data from the experiment are shown in the table above. which of the following claims is best supported by the observations

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

For the reaction shown, calculate how many moles of no2 form when each of the following completely reacts. 2n2o5(g)→4no2(g)+o2(g) part a 1.0 mol n2o5 express your answer using two significant figures. nothing mol m o l request answer part b 5.4 mol n2o5 express your answer using two significant figures.

Which organism develops breathing organism develops breathing organs from pharyngeal arches? shark, spider, sea star, sea horse