Given the equations below, what is the total enthalpy change for the formation of phosphorus pentachloride, pcl5, when phosphorus is burned in excess chlorine?

p4(s) + 6cl2(g) → 4pcl3(g), ∆h = –1224 kj

4pcl3(g) + 4cl2(g) → 4pcl5(g), ∆h = –372 kj

p4(s) + 10cl2(g) → 4pcl5(g)

a.852 kj
b.–852 kj
c.–1596 kj
d.1596 kj

The agent of mechanical weathering in which rock is worn away by the grinding action of other rock particles is call

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The atomic radius of sodium is 186 pm and of chlorine is 100 pm. the ionic radius for na+ is 102 pm and for cl– is 181 pm. in going from na to cl in period 3, why does the atomic radius decrease while the ionic radius increases? a. the inner electrons in the sodium cation shield its valence electrons more effectively than the inner electrons in the chloride anion do. b. the inner electrons shield the valence electrons more effectively in the chlorine atom than in the chloride anion. c. the outermost electrons in chloride experience a smaller effective nuclear charge than those in the sodium cation do. d. the outermost electrons in chloride experience a larger effective nuclear charge than those in the sodium cation do. e. monatomic ions are bigger than the atoms from which they are formed.