How many moles of CO2 will be produced from 97.0 g of C3 Hy, assuming O2 is available in excess?

Explanation:

Regardless of the value of the y subscript, the number of moles of CO₂ that can be produced from 1 mol of   is 3 moles: that is so because every molecule of   contains 3 atoms of C and every atom of C produces one molecule of  CO₂.

Then, you can calculate the number of moles of   in 97.0g using the molar mass of the compound:

1. Molar mass of     :

2. Number of moles = mass in grams / molar mass

                                           =   97.0 g / (36 + y)g/mol = 97.0/(36+y) mol

3. Number of moles of CO₂

As stated above, the number of moles of CO₂  is 3 times the number of moles of     :

For instance, imagine the compound is C₃H₈. How many moles of CO₂ will be produced from 97.0 g of C₃H₈?

You can replace 8 for y:

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.