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:

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the atomic mass is the bottom number on the element.

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