The reaction of nh3 and o2 forms no and water. the no can be used to convert p4 to p4o6, forming n2 in the process. the p4o6 can be treated with water to form h3po3, which forms ph3 and h3po4 when heated. part a find the mass of ph3 that forms from the reaction of 1.10 g nh3.

The series of reactions is:

4 NH3 + 5 O2 → 4 NO + 6 H2O 
6 NO + P4 → P4O6 + 3 N2 
P4O6 + 6 H2O → 4 H3PO3 
4 H3PO3 → PH3 + 3 H3PO4 

We multiply the first equation by a number 3 and all the other equations by number 2, so that we get: 
12 NH3 + 15 O2 → 12 NO + 18 H2O 
12 NO + 2 P4 → 2 P4O6 + 6 N2 
2 P4O6 + 12 H2O → 8 H3PO3 
8 H3PO3 → 2 PH3 + 6 H3PO4 

Then the overall reaction is: 
12 NH3 + ... → 2 PH3 + ... 

So calculating for PH3:
(1.10 g NH3) / (17.0306 g NH3/mol) x (2/12) x (33.9976 g PH3/mol) = 0.366 g PH3

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.