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How many kilojoules are released by freezing 32 g of H2O?
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- The recommended daily caloric intake is 2000 calories (8,400,000J). This is because this is the same value for how much the average body loses to heat and work in a typical day (your change in energy is zero because you take in the same amount of energy you lose). A) If you lose a total of 8,400,000J (Qout+W=total lost), but consume 1200 calories of food (5,000,000J), what would your change in energy be? B) Assuming your change in energy is negative (hint-it should be), where does your body get the extra energy to maintain it's temperature?On food labels, we can read the food-calories of the product. The food calorie is written as "Cal" and it corresponds to 1.000 calories with the lower case 'c! In summary, one food-calorie - 1 kcal = 1 Cal = 4.186 Joules How many Joules will be released by combustion of 1 kg of rice, if rice has 3,200 food-calories per kilogram? O 1.3 J O 13,395,200J O 13J O 1,340 JAn adult inhales about 6.0××10−4−4 m3m3 of fresh air during a breath. Only 20%% of fresh air is oxygen. Assume the pressure in the lungs is 1.0××1055 PaPaand the air is at a temperature of 300 KK. How many oxygen molecules are in each breath?
- The average American daily diet consists of 2,400 kilocalories. A kilocalorie contains 4814 J. Assume that this daily intake of kilocalories is completely metabolized at a uniform rate over a 24 hour period. What is the average power generation of the average American over the 24 hour period? Report your answer in units watts (W). I recieved 4814W per 24 hours but am unsure if I am correct.A) What is an equation to equate KE and GPE? B) A gas is held in a container of 15 m^3 in volume and a pressure of 5 Pa. If the volume isincreased to 26 m^3 what is the pressure of the gas? c)A syringe has a volume of 5 cm^3 and a temperature of 300 k. Upon heating the syringeexpands to a volume is now 5.5cm^3, what is the temperature of the syringe?If 2.25 gg of orange mercury oxide decomposes to 2.09 gg of liquid mercury and oxygen gas, what is the mass of oxygen produced?
- When air pollution is high, ozone contents can reach 0.6 ppm. How many molecules of ozone are present per liter of polluted air if the barometric pressure is 755 mmHg and the temperature is 79 °F?A sample of oxygen gas has a volume of 2.50L at STP. How many grams of O, are present?In the 1930s, the biologist Max Kleiber studied animals' metabolic rates. He 3 4 1 expressed the ratio of the rates for two animals by the relation where "1 %3D m1 and 2 are the animals' metabolic rates and m1 and m2 are the animals' masses. a) Compare the metabolic rates of a 70-kg man and a 15-kg dog. b) Compare the metabolic rates of a 5-kg cat with that of a 50-g mouse. c) Compare the metabolic rates of a 10-g hummingbird and a 5000-kg elephant.
- Estimate how many large maple trees would be needed to run a dishwasher for one year. Assume the dishwasher uses 1.1 ×108Jof energy per year and a large maple tree captures 10 kg of carbon (in CO2) per year. Assume the power plant that generates the electricity is 37 %% efficient at converting the carbon in coal to electrical energy and that typical coal releases 40,000 kg of carbon (as CO2) per terajoule of energy when burned.At which temperature could water contain the most dissolved gas at a pressure of 101.3 kPa?When air pollution is high, ozone contents can reach 0.6 ppm. How many molecules of ozone are present per liter of polluted air if the barometric pressure is 755 mmHg and the temperature is 79 oF?
