Part C Recycling aluminum consumes 95% less energy than refining the ore. Consid

Question

Part C Recycling aluminum consumes 95% less energy than refining the ore. Consider a material that requires a total energy of 100 kWh for refining if recycling requires 95% less energy compared to refining, the same mass of material can be recycled using 5 kWh of energy because 100 kW-95 kWh-5 kWh. The 95 kWh is the energy saved. About 17 kWh of electricity is required to refine 1.0 kg of aluminum from its ore (17 kWh/kg). How many million kWh of energy is saved if a plant recycles 75 million kg of aluminum? Express your answer numerically to two significant figures in million kWh. Since the units are million kWh, you may skip multiplying by 10 View Available Hint(s) 0? million kWh Submit Provide Feedback Next>

Explanation / Answer

1 kg of aluminium requires 17 KWh

when recylced energy required= 17*0.95

energy saved per kg of aluminium= 17*(1-0.95)= 17*0.05=0.85 Kwh

1 kg of aluminium saves 0.85 Kwh of energy

75*106 kg of aluminium saves on recylce 75*106*0.85/1=6.375*107 Kwh=6.375*10*106 Kwh= 63.75 millon Kwh

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