Answers created by Surbhi Goel

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• Is the following reaction endothermic or exothermic? #Ca_((S)) + 2C_(s) -> CaC_(2(S)) + 62.8 kJ#?
  
• Using the equation #N_2 + 3H_2 -> 2NH_3#, how many grams of hydrogen must react if the reaction needs 127 grams of #NH_3#?
  
• What is number of valence electrons for sodium?
  
• How many unpaired electrons does an atom of sulfur have in its ground state?