Respuesta :
66 gms the mass of carbon dioxide (in grams) that will be produced when enough propane (C3H8) is burned to yield 250.0 kJ of heat.
Mole fractions are chemistry's unit of measurement. Therefore, it is important to convert propane mass to moles. Next, create a balancing equation that compares the amount of propane to carbon dioxide by moles. Finally, carbon dioxide must be converted from moles to grams.
[tex]C3H8+5O2=[/tex][tex]=3CO2+4H2O[/tex]
The balancing equation for burning propane in oxygen is shown here.
It is clear from the equation that 1 mole of propane produces 3 moles of carbon dioxide, or a ratio of 1:3.
Divide 22 grams of propane by its molar mass to get its molecular weight.
3 x 12 = 36 grams
1 x 8 = + 8 grams
total = 44 grams/ mole.
22/44 = 0.5 moles of propane.
Using the ratio of 1:3 .5 = 3( .5) = 1.5 moles of Carbon Dioxide.
Now multiply 1.5 moles of Carbon Dioxide by the molar mass of Carbon Dioxide
1 x 12 = 12 grams
2 x 16 = +32 grams
total = 44 grams /mole.
Final result:
1.5 moles x 44 grams/mole = 66 grams.
What are Exothermic Reactions ?
When new bonds form in the products, less energy is produced during an exothermic reaction than is required to break bonds in the reactants. Energy is continuously released during an exothermic process, frequently in the form of heat. Exothermic reactions characterize all combustion processes.
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