Assume that 1.0 mol of c4h10 is completely burned in excess oxygen to form carbon dioxide and water. how many moles of co2 would be produced?

You need to first write a chemical equation and balance it
 C₄H₁₀ + O₂ → CO₂ + H₂O
2 C₄H₁₀ + 13 O₂ → 8 CO₂ + 10 H₂O
1.0 moles               X moles
1.0 mol C₄H₁₀ () = 4 moles of CO₂

Yes, endothermic means it turns cold. and some chemical changes include change of tempature.