Ammonia reacts with copper(II) oxide at high temperatures to produce copper metal, nitrogen gas and water vapor as described by the unbalanced equation below. How many grams of copper(II) oxide are needed to react with 0.513 moles of ammonia gas? 2 NH3(g) + 3 CuO(s) --> 3 Cu(s) + N2(g) + 3 H2O(g)

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the answer would be a

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.