01. Determine the enthalpy of reaction for: 2 N2(g) + 5 O2(g) à 2 N2O5(g) ΔH°rxn = ? Given the following equations:

2H2(g) + O2(g) à 2 H2O(l)
ΔH°rxn = –571.6 kJ
N2O5(g) + H2O(l) à 2 HNO3(l)
ΔH°rxn = –73.7 Kj
N2(g) + 3 O2(g) + H2(g) à 2 HNO3(l)
ΔH°rxn = –348.2 kJ

astronomers such as edwin hubble.

the answer is:  

line graphs show patterns in data with variables that change over time; whereas, circle graphs show data as parts out of a whole (such as out of 100%).

shield volcanos are angry and get mad over the smallest things so much that there heads erupt   pahoehoe and a'a lava. a composite volcano is the poller opposite of a shield volcano. its   peaceful thing and knows how to control its emotions.      

a. the law of proportion states the combination of 2 atoms in a specific ratio to produce multiple compounds such as the given statement of question ‘1st compound contains 88.8 % cu ’ indicates 88.8 g of cu is present along with 11.2 g oxygen in 100 g of compound whereas the statement ‘2st compound contains 79.9 % cu ’ indicates 79.9 g of cu is present along with 20.1 g oxygen in 100 g of compound

1st compound contains 88.8 g cu

for cu

m = 63 g /mol

atomic % = 88.8 /63 = 1.42

for o

m = 16 g /mol

atomic % = 11.2 /16 = 0.7

b. the emperical formula of 1st compound is

cu1.4o0.7

cu2o