How many moles of o2 are needed to react with 2.60 moles c2h2

To determine the moles of O₂ needed, we have to know in what ratio the two reactants react and then use the moles of C₂H₂  in reaction to determine the moles of O₂  needed. We can find this out based on their coefficient in a balanced equation:

Write a Balance Equation

2C₂H₂  +   5O₂   →     4CO₂   +   2H₂O

Compare the Mole Ratio (Equation Coefficient of C₂H₂  to  O₂)

Based on the equation, the mole ratio of C₂H₂  to  O₂  is 2 to 5. Therefore for every molecule of C₂H₂, ⁵/₂ C₂H₂ molecules are needed to react.

Find the moles of O₂

Since the number of moles of  C₂H₂   =    2.60 moles

                                then moles of O₂ = 2.60 moles × ⁵/₂

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.

a 20-cm-long, cylindrical graphite (pure carbon) rod is inserted into an oxidizing atmosphere at 1145 k and 1.013 x 105 pa pressure. the oxidizing process is limited by the diffu- sion of oxygen counterflow to the carbon monoxide that is formed on the cylindrical surface.