I have answered parts a and b. However, I don\'t know how to find the fraction o

Question

I have answered parts a and b. However, I don't know how to find the fraction of mass converted to energy. Any help would be appreciated.

Problem8 a) A 12 V lead-acid car battery, engineered for up to 500 or more charge/discharge cycles', has a rating of 225.0 A hr. (It sells for $180.00.) Calculate the total amount of charge that moves through the battery before it needs to be recharged 8.10x105 C You are correct. Computer's answer now shown above Your receipt is 170-9775 b) What is the total electrical energy that the battery can deliver before it needs to be recharged? 9.72x106 J You are correct. Computer's answer now shown above Your receipt is 170-5523 es c) The total mass of the battery is 23.1 kg. (It weighs 51 Ib). What fraction of that mass is converted to electrical energy by the battery before it needs to be recharged? Submit Answer Tries Or6 d) How many kilograms of such batteries would be required to get the same mechanical energy (essentially mileage, for cars of the same total weight) as 16 gallons of gasoline? Assume that the efficiency of an electrically powered car is 2.5 times that of a gasoline-powered car for the conversion to mechanical energy. DATA: Energy content of 1 gallon of gas = 1 .32 x 108 J Submit Answer Tries Or6 e) One gallon of gasoline (mass = 2.8 kg) requires about 8.9 kg of Oxygen for combustion. What fraction of the mass is converted to energy? Submit Answer Tries 0/6

Explanation / Answer

the total charge present in battery = charge in Ampere_hour of battery = 225*3600 = 8.1*10^(5) C

so battery gonna supply this much of charge ntill it is flly discharged. ie (answer of (a))

net energy suppled by battery = potential difference provided by battery * total amount of charge supplie by battery

net energy = 12 * 8.1*106(5) = 97.2 * 10^(5) Jule

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