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Name: ____________________________________ Period: ________ Date: ______________________Unit III Study Guide and ReviewConvert 22 kg to g 22,000 gConvert 0.0463 km to mm 46,300 mmConvert 726,500 mL to kL. .7265 kLHow many hours are equivalent to 3450 seconds? 0.958 hoursThe speed limit in Canada is 100 km/hr. Convert this to meters/second. 28 m/sThe density of helium is 0.17 g/L at room temperature. Report the density of helium as g/mL. 0.01017 g/mLConvert 56.0 m/s to km/hr. 201.6 km/hrConvert 8,721,587.95 mm to km 8.72158795 kmConvert 0.0215879 Mg to g 21,587.9 gConvert 55,247 g/cm to kg/km 5,524,700 kg/kmConvert 684,312 s to hrs. 190 hoursConvert 865 m/s to km/hr 3114 km/hrConsider the following reaction:2 C2H6 + 7 O2 → 4 CO2 + 6 H2O + 3120 kJWhat is the molar heat of combustion of ethane (in kJ/mol)? 1560 kJ/molWhat is the heat of combustion of ethane (in kJ/g)? 52 kJ/gHow many moles of ethane would be needed to produce 50,000 kJ? 32 mol C2H6Consider the following reaction:2 C7H16 + 22 O2 → 14 CO2 + 16 H2O + _________ kJThe molar heat of combustion of heptane is 4,817 kJ/mol. How much energy is produced by the reaction above? 9,634 kJCalculate the molar mass of heptane. 100 g/molCalculate the heat of combustion of heptane. 48.17 kJ/gHow many moles of heptane need to be burned in order to produce 500 moles of carbon dioxide? 71.4 mol C7H16How many grams of heptane should be burned to produce 75,000 kJ? 1,557 g 7H16Consider the following reaction:2 C2H6 + 7 O2 → 4 CO2 + 6 H2O + 3120 kJHow many moles of ethane are required to produce 27,000 kJ of energy? 17.3 molHow many grams of ethane are required to produce 15,000 kJ of energy? 288.5 gHow many moles of carbon dioxide are produced if 130 mol of ethane are burned? 260 molHow many grams of water are produced during the combustion of ethane if 600 g of oxygen react? 289 gConsider the following reaction:2 C8H18 + 25 O2 → 16 CO2 + 18 H2O + 10,900 kJHow many moles of octane are required to produce 33,000 kJ of energy? 6.1 molHow many grams of octane are required to produce 22,000 kJ of energy? 460.2 gHow many grams of carbon dioxide are produced during the combustion of octane if 1,500 g of oxygen react? 1,320 gA cat burns 300,000 cal because it sits around and does nothing. 1,000 cal = 1 Cal (food calories). 4.2 J = 1 cal. Cat food provides 2,500 cal/g.How many food calories does the cat burn? 300 CalHow many Joules does the cat burn? 1,260,000 JHow many grams of food does the cat need to eat per day so it doesn’t gain or lose weight? 120 gHow many grams of food does the cat need to eat per day so that it has 30,000 extra calories? 132 gA hyper yippy annoying dog burns 1,000,000 cal because it barks all day and doesn’t stop jumping around. 1,000 cal = 1 Cal (food calories). 4.2 J = 1 cal. Dog food provides 3,750 cal/g.How many food calories does the dog burn? 1,000 CalHow many Joules does the dog burn? 4,200,000 JHow many grams of food does the dog need to eat per day so it doesn’t gain or lose weight? 267 gHow many grams of food does the dog need to eat per day so that it has 25,000 extra calories? 273 gAssume that a pickup truck’s gas tank can hold 15 gallons of gas. The truck can travel 270 miles on one tank of gas. It travels an average of 8,000 miles per year. Show your work.How many miles can the truck go using just one gallon of gasoline? 18 mi/galHow many gallons of gasoline does the truck use annually? 444 galIf the truck only uses 25% of the energy released by burning the gasoline, how many gallons of fuel are wasted each year? 333 galA pickup truck’s gas tank can hold 18 gallons of gas. The truck can travel 234 miles on one tank of gas. It travels an average of 9,000 miles per year. Show your work for the following problems.How many miles can the truck go on one gallon of gasoline? 13 mi/galHow many miles can the truck go on 3.5 gallons of gasoline? 45.5 miHow many gallons of gasoline does the truck use in 5 years? 3,461.5 gal If the truck only uses 30% of the energy released by burning the gasoline, how many gallons of fuel are wasted each year? 487.6 galA hybrid car can drive 540 miles on 12 gallons of gasoline. In one year the average car drives 11,000 miles. How far can the hybrid go on one gallon of gasoline? 45 miHow many gallons does the hybrid use in one year? 244 galHow far will the hybrid get on 35 gallons of gasoline? 1,575 miA non-hybrid car can drive 450 miles on 15 gallons of gasoline. In one year the car drives 9,000 miles.How far can the non-hybrid go on one gallon of gasoline? 30 mi/galHow many gallons does the non-hybrid use in one year? 300 galHow far will the non-hybrid get on 32 gallons of gasoline? 960 miConvert the following to kJ/g or kJ/mol.Hexane: 48.2 kJ/g 4145 kJ/molButane: 49.3 kJ/g 2859 kJ/molOctane: 5450 kJ/mol 47.8 kJ/gMethane: 890 kJ/mol 55.6 kJ/gCopper has a heat capacity of 0.385 J/g°C. A 10 foot long copper pipe that has a mass of 15,000 g absorbs 500 kJ of heat energy. How much does the temperature of the pipe rise? 86.6 °C In a laboratory activity, a student team measures the heat released by burning a fuel. The following data was collected by the lab team.Lab DataMass of water200 gMass of fuel burned0.37 gRoom temp. (initial)21°CMolar mass of fuel218 g/molRoom temp. (final)26°CCalorimetry coefficient5Water temp. (initial)50°CMass of pop can7.3 gWater temp. (final)67°CMinutes burned12 min.Calculate the amount of heat the water absorbs. 14,280 JCalculate the heat of combustion of the fuel. 38.6 kJ/gIn a laboratory activity, a student team measures the heat released by burning an unknown fuel source. The following data was collected.Mass of water:92.5 gInitial water temperature:16.2 CFinal water temperature:37.9 CMass of fuel burned:0.39 gRoom temperature: 23 CCalorimetry coefficient:29Calculate the amount of heat (in kJ) that the water absorbs. 8.4 kJIf the molar mass of the fuel source was 92 g/mol, what is the molar heat of combustion of the fuel source? 1,987 kJ/molConsider the following reaction:2 C2H6 + 7 O2 → 4 CO2 + 6 H2O + 3120 kJCalculate the molar heat of combustion for the burning of ethane above. 1,560 kJ/molCalculate the heat of combustion for the burning of ethane above. 52 kJ/gConsider the following reaction:2 C8H18 + 25 O2 → 16 CO2 + 18 H2O + 10,900 kJCalculate the molar heat of combustion for the burning of octane above. 5,450 kJ/molCalculate the heat of combustion for the burning of octane above. 47.8 kJ/gIn a laboratory activity, a student team separately measures the heat released by burning two different fuel sources. The following data was collected for each fuel:Fuel 1Fuel 2Mass of water150 gMass of water112 gRoom temp.22°CRoom temp.22°CInitial water temp.15°CInitial water temp.32°CFinal water temp.55°CFinal water temp.85°CMass of fuel burned0.58 gMass of fuel burned0.65 gCalculate the amount of energy that went into the water from fuel 1. 25.2 kJCalculate the amount of energy that went into the water from fuel 2. 24.9 kJCalculate the heat of combustion for fuel 1. 43.4 kJ/gCalculate the heat of combustion for fuel 2. 38.4 kJ/gCalculate the molar heat of combustion for fuel 1, given that the molar mass of fuel 1 is 112 g/mol. 4,861 kJ/molCalculate the molar heat of combustion for fuel 2, given that the molar mass of fuel 1 is 96 g/mol. 3,682 kJ/molHow much heat is absorbed when 500 g of water is heated from 18°C to 47°C? 60.9 kJHow much heat is given off when 750 g of water is cooled from 85°C to 32°C? 167 kJA 770 g block of glass (cglass = 0.50 J/g°C) absorbs 1.7 kJ of heat energy. How much does the temperature of the glass rise? You must convert kJ to Joules. 1,000 J = 1 kJ. 4.4 °CA 12,000 g copper pipe (ccopper = 0.385 J/g°C) absorbs 10.3 kJ of heat energy. How much does the temperature of the copper rise? You must convert kJ to Joules. 1,000 J = 1 kJ. 2.2°CThe temperature of a silver coin (csilver = 0.24 J/g°C) falls by 353°C as it releases 5,550 J of heat. What is the mass of the coin? 65.5 gThe temperature of a gold coin (csilver = 0.229 J/g°C) falls by 450°C as it releases 8.5 kJ of heat. What is the mass of the coin? You must convert kJ to Joules. 1,000 J = 1 kJ. 82.5 gAn unknown substance with a mass of 75 g released 7,000 J when it is cooled from 135°C to 62°C. What is the specific heat capacity of the unknown substance? 1.28 J/g °CAn unknown substance with a mass of 522 g released 640,000 J when it is cooled from 752°C to 331°C. What is the specific heat capacity of the unknown substance? 2.9 J/g°CUnit IV Practice ProblemsTemperature ConversionsWhat is -250 °C in Kelvin? 23 KWhat is 275 K in degrees Celsius? 2 °CGas LawsA scuba diver inflates a balloon to 0.25 ft3 at a depth of 99 ft (where the pressure is about 4 atm). Assume that temperature remains constant. What will the volume of the balloon be at the surface, where the pressure is 1.0 atm? 1 ft3Suppose 500.0 mL of oxygen is collected at 25 °C and 110 kPa. What will the temperature be if the volume is increased to 550 mL and pressure remains constant? 327.8 KTennis balls are pressurized to 1.75 atm in a factory at 30 °C. When they are taken outside on a wintry day, their pressure decreases to 1.6 atm. What is the temperature outside? 277 k or 4 °CAt what temperature would 2.1 moles of N2 gas have at a pressure of 1.24 atm in a 25 L tank? 179.8 KHow many moles of gas does it take to occupy 120 liters at a pressure of 2.3 atmospheres and a temperature of 0 °C? 12.3 molIf I have a 50 liter container that holds 45 moles of a gas at a temperature of 200 °C, what is the pressure inside the container? 34.95 atmCalculate the new volume of a 7.0 L balloon if the pressure is reduced from 1.0 atmosphere to 0.80 atmosphere (assume the temperature remains constant). 8.75 atm.The volume of a container is halved by pushing down the attached piston. What will happen to the pressure, if temperature remains constant? DoubleWhat is the new volume of a 7.0 L balloon when it is brought from a location where the temperature is 30 C to a location where the temperature is 25 C (pressure remains unchanged at 1.0 atmosphere)? 6.88 LIf a gas is stored in a rigid metal container, how would reducing its temperature by 1/5 affect the pressure? Reduce it by 1/5 as wellWhat volume would 10.0 g of gaseous CO2 occupy at STP? 5.1 LDetermine the pressure exerted by 0.25 mol neon gas in a 2.75 L container at 35 °C. 2.3 atmWhat pressure will 4.5 mol of gas exert, if the gas occupies a 10.0 L container at a temperature of -20 °C? 9.35 atmSpecific Heat CapacityHow much energy is gained by a 40.8 g sample of water whose temperature increases from 22 C to 35 C when left in the sun? 2.2 kJThe chemistry classroom has roughly 180,000 liters of air in it. If the density of air is 0.0012 g/mL and the specific heat capacity of air is 1.00 J/g°C, what is the mass of the air in the room? 216 kgUsing the information from the previous question, calculate the amount of energy it would take to heat up the room from 18 °C (64 °F) to 22 °C. 864 kJ ................
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