In nature, sulfur is most commonly found in ________. A) pure ...

[washai]

In nature, sulfur is most commonly found in ________.
 
  A) pure elemental sulfur
  B) sulfur oxides
  C) metal sulfides
  D) sulfuric acid
  E) H2S

Question 2

At elevated temperatures, dinitrogen pentoxide decomposes to nitrogen dioxide and oxygen: 2N2O5(g)  4NO2 (g) + O2 (g) When the rate of formation of NO2 is 5.5  10-4 M/s, the rate of decomposition of N2O5 is ________ M/s.
 
  A) 2.2  10-3
  B) 1.4  10-4
  C) 10.1  10-4
  D) 2.8  10-4
  E) 5.5  10-4

Question 3

The combustion of propane (C3H8 ) in the presence of excess oxygen yields CO2 and H2O: C3H8 (g) + 5O2 (g)  3CO2 (g) + 4H2O (g) When 2.5 mol of O2 are consumed in their reaction, ________ mol of CO2 are produced.
 
  A) 1.5
  B) 3.0
  C) 5.0
  D) 6.0
  E) 2.5

Question 4

Which of the following molecules has hydrogen bonding as its only intermolecular force?
 
  A) HF
  B) H2O
  C) C6H13NH2
  D) C5H11OH
  E) None, all of the above exhibit dispersion forces.

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[washai]

Thanks for the timely response, appreciate it

[shailee]

Gracias!