l Verizon7:46 PM69%XF 2019 CHEM 132 Exam 3 makeup...1 of 1CHtsGas pipelines are used to deliver natural gas (methane, CH4, 16.043 g/mol) to various regions inthe U.S. The total volume of methane delivered is approximately 2.7 x 1012 L per day, measuredat STP. Calculate the total entha I py change for the combustion of this amount of methane.1.CH4 (g)2 02 (g)CO2 (g)2 H20 (g)A 4.00 g sample of a mixture of BaO and CaO is placed in a 1.00 L vessel containing CO2 at a2.pressure of 730 torr and a temperature of 298 K. The CO2 reactions with both oxide reagents toform BaCO3 and CaCO3. When the reaction is complete, the pressure of the remaining CO2 is 150torrCalculate the total number of moles of CO2 that has reactedа.b.Calculate the mass percentage of CaO in the initial mixture.Microwave ovens use microwave radiation to heat food. The energy of the microwaves is3absorbed by water molecules in the food and then transferred to the rest of the foodSuppose the microwave radiation has a wavelength of 11.2 cm. How many photons arerequired to heat 2.00 x 102 mL of coffee from 23 to 60 °C?If the power of the microwave is 9.00 x 102 W (1 Watt 1 Joule/second), how longa.b.would you have to heat the coffee?

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Asked Nov 15, 2019
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l Verizon
7:46 PM
69%
X
F 2019 CHEM 132 Exam 3 makeup...
1 of 1
CH
ts
Gas pipelines are used to deliver natural gas (methane, CH4, 16.043 g/mol) to various regions in
the U.S. The total volume of methane delivered is approximately 2.7 x 1012 L per day, measured
at STP. Calculate the total entha I py change for the combustion of this amount of methane.
1.
CH4 (g)2 02 (g)
CO2 (g)2 H20 (g)
A 4.00 g sample of a mixture of BaO and CaO is placed in a 1.00 L vessel containing CO2 at a
2.
pressure of 730 torr and a temperature of 298 K. The CO2 reactions with both oxide reagents to
form BaCO3 and CaCO3. When the reaction is complete, the pressure of the remaining CO2 is 150
torr
Calculate the total number of moles of CO2 that has reacted
а.
b.
Calculate the mass percentage of CaO in the initial mixture.
Microwave ovens use microwave radiation to heat food. The energy of the microwaves is
3
absorbed by water molecules in the food and then transferred to the rest of the food
Suppose the microwave radiation has a wavelength of 11.2 cm. How many photons are
required to heat 2.00 x 102 mL of coffee from 23 to 60 °C?
If the power of the microwave is 9.00 x 102 W (1 Watt 1 Joule/second), how long
a.
b.
would you have to heat the coffee?
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l Verizon 7:46 PM 69% X F 2019 CHEM 132 Exam 3 makeup... 1 of 1 CH ts Gas pipelines are used to deliver natural gas (methane, CH4, 16.043 g/mol) to various regions in the U.S. The total volume of methane delivered is approximately 2.7 x 1012 L per day, measured at STP. Calculate the total entha I py change for the combustion of this amount of methane. 1. CH4 (g)2 02 (g) CO2 (g)2 H20 (g) A 4.00 g sample of a mixture of BaO and CaO is placed in a 1.00 L vessel containing CO2 at a 2. pressure of 730 torr and a temperature of 298 K. The CO2 reactions with both oxide reagents to form BaCO3 and CaCO3. When the reaction is complete, the pressure of the remaining CO2 is 150 torr Calculate the total number of moles of CO2 that has reacted а. b. Calculate the mass percentage of CaO in the initial mixture. Microwave ovens use microwave radiation to heat food. The energy of the microwaves is 3 absorbed by water molecules in the food and then transferred to the rest of the food Suppose the microwave radiation has a wavelength of 11.2 cm. How many photons are required to heat 2.00 x 102 mL of coffee from 23 to 60 °C? If the power of the microwave is 9.00 x 102 W (1 Watt 1 Joule/second), how long a. b. would you have to heat the coffee?

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Expert Answer

Step 1

(a)

Heat required to increase the temperature of coffee is calculated as follows

Specific heat capacity of water is 4.184 J/g.oC.

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Mass of coffee = Density x Volume = (0.997 g/mL)(2x10 mL) = 199.4 g ΔΤ-Τ,-Τ AT = T, - T = (60°C)-(23°C) = Heat, q mcAT = (199.4 g) (4.184 J/g.°C) (37°C) 30868.7 J

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Step 2

Number of photons to increase the temperature of coffee ...

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hc Energy of one photon, E (6.626x103 J.s)(2.998x 10 m/s) 0.112 m - 1.77 x 1024 J 30868.7 J 1.74x 1028 photons No. of photons -24 1.77 x 104 J Hence, 1.74x1028 photons are needed

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