When an electrical appliance whose power usage is X watts is run for Y seconds, it uses X × Y joules of energy. The energy unit used by electrical utilities in their monthly bills is the kilowatt-hour (kWh, that is, 1 kilowatt used for 1 hour). How many joules are there in a kilowatt-hour? If electricity costs $.09 per kilowatt-hour, how much does it cost per megajoule?

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Q: A system undergoes a process consisting of the following two steps: Step 1: The system absorbs 71 J…

A: The relationship between the parameters is given as where w = work and q = heat

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A: To solve this problem we will use the formula  Q = m•c•∆T  Where, Q = heat absorbed or released  m =…

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Q: A system undergoes a process consisting of the following two steps: Step 1: The system absorbs 72 J…

A: Please have a look on the solution attached below

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A: The balanced reaction taking place is given as, 4 Fe(s) + 3 O2(g) → 2 Fe2O3(s)…

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A: The light activity lije reading or watching television required 7kj/min 1kJ= 0.239 Kcal. 7Kj=…

Q: What is the kinetic energy of a 0.146 kilogram baseball moving at a velocity of 44.8 meters per…

A: Given that:  Mass of baseball(m) = 0.146Kg  Velocity(v) = 44.8m/s

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A: Given :  Mass of carbon = 5.35 kg  Since , 1 kg = 1000 gm  => Mass of carbon = 5350 gm  Also,…

Q: If a system has 5.00 x 10° kcal of work done to it, and releases 5.00 x 10' kJ of heat into its…

A: Since you have posted multiple questions, we are entitled to answer the first only. 1) Given: Work…

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A: This question is related to law of calorimetry in thermodynamics.

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Q: 6. How much work is needed in a system to expand from 25 to 50 L against a pressure of 7 atm? Is…

A: Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: An air conditioner (AC) is a cooling device in which the inside of the house can act as the cold…

A: Work = power x time  = (1.7 x 103 W) x (24 hour) =(1.7 x 103 W) x (24x60x60 seconds) = 1.47 x 108 J…

Q: Deterioration of buildings, bridges, and other structures through the rusting of iron costs millions…

A: • Molar mass of iron rust (fe2O3) = 2× atomic          mass of fe + 3 × atomic mass of O.…

Q: A system undergoes a process consisting of the following two steps: Step 1: The system absorbs 69 J…

A: Given data,Step 1:Heat(Q)=69JWork(w)=-34J(-ve sign represent work is done on the system)Step…

Q: Resting metabolism. Suppose a body loses heat to the environment at the rate of 100 J/ hr. How long…

A: Since you have posted multiple questions, we are entitled to answer the first only.

Q: What is the specific heat capacity of a metal if it requires 142 J to change the temperature of 5.75…

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Q: A system undergoes a process consisting of the following two steps: Step 1: The system absorbs 68 J…

A: The process happening on the system is of two steps given as,

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A: We will use the Hess's Law to find out the net change in enthalpy for the reaction. The reactions…

Q: Resting metabolism. Suppose a body loses heat to the environment at the rate of 100 J/ hr. How long…

A: 2) Given : Rate of heat lost at resting position = 100 J/hr And total energy of cookie = 60 cal…

Q: 3.23×103 kJ to kW⋅h Express the value in kilowatt-hours to three significant figures.

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A: Assume that it is possible to heat water with perfect insulation (all the heat from combustion of…

Q: A serving size of four cookies contains 7 g of fat, 16 g of carbohydrates, and 5 g of protein. If…

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Q: A house is designed to have passive solar energy features, brickwork incorporated into the interior…

A: Gallons of water have to be converted to litre:

Q: certain mass of substance 10 releases 3.19 kJ of energy.  If the initial temperature was 91.8  and…

A: q = mc∆T  q is the heat ,m is the mass, c is the specific heat, ∆T = Change in temperature  q =…

Q: The lead-acid storage battery is the oldest rechargeable battery in existence. It was invented in…

A: We have  H2SO4 (l) →SO3 (g) + H2O (l) .............1  ∆H1=113kJ Pb(s) + PbO2(s) +2 SO3(g) →2…

Q: 343 CalCal to kilowatt-hours Express your answer using three significant figures.

A: Given : Value in Cal = 343 Cal

Q: 7. Determining the Sign of AH Indicate the sign of the enthalpy change, AH, in these processes…

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Q: If a system has 375 kcal of work done to it, and releases 5.00 x 10² kJ of heat into its…

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Q: A certain two-stepP process involves transfer of heat and work between the system and the…

A: From first law of thermodynamics, we have : ∆E = q + w  where ,∆E = change in internal energy.   If…

Q: 4. Andy has a bath and uses 1500g of water heated from 10°C to 40°C and with a specific heat…

A: 4)Q =mc∆T m = 1500g = 1500*10-3Kg c = 4200 j/kg0C, ∆T = 40-10 = 300C Q = 1500*10-3Kg*4200 J/Kg0C *…

Q: What are the pros and cons of the utilization of hydrogen gas as a source of energy? What are the…

A: Hydrogen is most basic element. It is very abundant in nature.It can be separated  in electroysis.…

Q: A layer of copper welded to the bottom of a skillet weighs 125 g. How much heat is needed to raise…

A: m= 125 g C= 0.387 J/g K Tfinal = 300°C = 300+273 = 573 K Tinitial= 25°C = 25+273 = 298K ∆T = Tf - Ti…

Q: A system undergoes a process consisting of the following two steps: Step 1: The system absorbs 71 J…

A: The first law of thermodynamics states that the change in internal energy of a system equals the net…

Q: A 31.1-g wafer of pure gold, initially at 69.3 °C, is submerged into 64.2 g of water at 27.8 °C in…

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Q: During a very light activity, such as reading or watching television, the average adult expends…

A: Given: Energy expenditure per minute by an average adult = 7 kJ = 7000 J We know, 1 J = 2.39 x 10-4…

Q: If a system produces 135.0 kJ of heat and does 45.0 kJ of work on the surroundings, what is the ∆E…

A: The first law of thermodynamics is mathematically expressed as: ∆E=Q+W ...........................…

Q: A system undergoes a process consisting of the following two steps: Step 1: The system absorbs 74 J…

A: We have given that a system undergoing a process consisting of two given steps. And asked for the ∆E…

Q: If a system has 225 kcal of work done to it, and releases 5.00 x 10² kJ of heat into its…

A: Given, Work done on the system W=225 Kcal    {As work is done by the system , so  W is +ve} Heat…