An automobile burns 65 grams of gasoline over 20 minutes. The gasoline combines with 100 grams of oxygen in this reaction, to form carbon dioxide and 47 grams of water. How much carbon dioxide is formed?
do I use the heat capacity equation?
How much oxyen is used to produce 47 g H2O?
47g/18 = ?? mols H2O
mols O = Mols H2O = xx
mols oxyen x 16 =yy g oxygen.
100 g oxygen - g used to produce H2O = g used to produce CO2.
Convert g used to produce CO2 to mols O and then to g CO2.
Check my thinking. About 80 g CO2 estimate.
To answer the first question, you need to use stoichiometry - the relationship between the amounts of reactants and products in a chemical reaction. Here's how you can approach this using the given information:
1. Determine the amount of oxygen used to produce 47 grams of water:
You correctly calculated the number of moles of water (H2O) by dividing 47 grams by the molar mass of water (18 grams/mol). This gives you the number of moles of water produced. Since the balanced equation shows that 1 mole of water requires 100 grams of oxygen, the number of moles of oxygen used is equal to the number of moles of water.
2. Convert moles of oxygen to grams of oxygen:
Multiply the number of moles of oxygen by the molar mass of oxygen, which is 16 grams/mol. This will give you the amount of oxygen used in grams to produce the water.
3. Determine the amount of oxygen used to produce carbon dioxide:
Since the reaction is balanced, the amount of oxygen used to produce carbon dioxide is equal to the initial amount of oxygen minus the amount used to produce water. Subtract the grams of oxygen used to produce water from the initial 100 grams of oxygen to obtain the grams of oxygen used to produce carbon dioxide.
4. Convert grams of oxygen used to produce carbon dioxide to grams of carbon dioxide:
To convert the grams of oxygen used to produce carbon dioxide to grams of carbon dioxide, you need to use the molar mass of carbon dioxide, which is 44 grams/mol. Divide the grams of oxygen used to produce carbon dioxide by the molar mass of oxygen, then multiply by the molar mass of carbon dioxide.
Based on your estimate, it seems that you have followed these steps correctly. Using this approach, you estimated that around 80 grams of carbon dioxide should be formed.