wis× Digital Resources for Smartworks xC Search Textbook Solutic 11/29/17 O 0101

Question

wis× Digital Resources for Smartworks xC Search Textbook Solutic 11/29/17 O 0101 40 05 Question (2 poits) The combustion of natural gas in the presence of oxygen produces heat. As a result, natural gas is a primary fuel for heating and cooking in industrialized countries Where does this thermal energy come from on the molecular level? 1st attempt see Periodic Table Part 1 (0.4 polnt) How many moles of bonds between which pairs of atoms are braken during the combustion of 2 moles of methane /CHal gas? Treat a double bond or a triple bond as one bonding interaction (ie 1 mole of trigle bonds equals 1 mole of bonds). Choose one or more A. 2 moles of C-H bonds u B. 4moleso, O-H bonds C2moles of C-O bonds D 8 moles of C-H bonds E 8 moles O-H bonds F4 moles of C-O bonds G,.moles oto-obnds Part 2 (0.4 point 05

Explanation / Answer

Ans 5 :

The balanced reaction for the combustion of methane is given as :

CH4 + 2O2 = CO2 + 2H2O

Part 1 :

Ans : D) 8 moles of C-H bonds and G) 4 moles of O-O bonds

Part 2 : Absorbed

Energy is utilised to break the bonds , i.e. absorbed

Part 3 : d) 4 moles of C-O bonds and F) 8 moles of O-H bonds

Part 4 : released

Energy is released when the new bonds are formed.

Part 5: A) The sum of the energies os all the bonds in 2 mol CH4 and 4 mol O2

Since energy is released , the enthalpy of the reaction is negative. This indicates that the energy of the bonds of products is less than the energy contained in the bonds of reactants , and hence the difference is released as heat.

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