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A typical car driven 20,000 km a year emits to the atmosphere about 11 kg per year of NOx (nitrogen oxides), which cause smog in major population areas. Natural gas burned in the furnace emits about 4.3 g of NOx per therm (1 therm= 105,500 kJ), and the electric power plants emit about 7.1 g of NOx per kWh of electricity produced. Consider a household that has two cars and consumes 9000 kWh of electricity and 1200 therms of natural gas per year. Determine the amount of NOx emission to the atmosphere per year for which this household is responsible.

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The amount of NOx emission produced by a household is required.

The total amount of NOx the household is responsible for is 91.06 kg.

1 car produces 11 kg of NOx per year.

Natural gas burning produces 4.3 g of NOx per therm.

Electric power plant produces 7.1 g of NOx per kwh.

2 cars will produce [tex]2\times 11=22\ \text{kg}[/tex] of NOx.

1200 therms of natural gas will produce [tex]1200\times 4.3=5160\ \text{g}[/tex]

9000 kWh will produce [tex]7.1\times 9000=63900\ \text{g}[/tex]

Converting all to kg and finding the total amount

[tex]22+5.16+63.9=91.06\ \text{kg}[/tex]

The total amount of NOx the household is responsible for is 91.06 kg.

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