Americans combined drive about 4.0 × 109 miles per day and their vehicles get an average of 20 miles per gallon of fuel used. For each 1 kg of gasoline that is burned, about 3.0 kg of CO2 are produced. How many kilograms of CO2 are emitted into the atmosphere each day by cars in the U.S.? One gallon of gas weighs about 3.5 kg.2.1 × 109 kg8.4 × 1011 kg1.7 × 108 kg93 kgnone of these
Question
Americans combined drive about 4.0 × 109 miles per day and their vehicles get an average of 20 miles per gallon of fuel used. For each 1 kg of gasoline that is burned, about 3.0 kg of CO2 are produced. How many kilograms of CO2 are emitted into the atmosphere each day by cars in the U.S.? One gallon of gas weighs about 3.5 kg.2.1 × 109 kg8.4 × 1011 kg1.7 × 108 kg93 kgnone of these
Solution
First, let's find out how many gallons of fuel are used each day:
4.0 × 10^9 miles per day / 20 miles per gallon = 2.0 × 10^8 gallons per day
Next, let's convert this to kilograms, using the fact that one gallon of gas weighs about 3.5 kg:
2.0 × 10^8 gallons per day * 3.5 kg/gallon = 7.0 × 10^8 kg per day
Finally, we know that for each 1 kg of gasoline that is burned, about 3.0 kg of CO2 are produced. So:
7.0 × 10^8 kg per day * 3.0 kg CO2/kg gasoline = 2.1 × 10^9 kg CO2 per day
So, the answer is 2.1 × 10^9 kg of CO2 are emitted into the atmosphere each day by cars in the U.S.
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