Helium Expandable
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 NWT DELSEY HELIUM SILVER LABEL 29 EXPANDABLE SUITER BLUE SUITCASE LUGGAGE  US $65.00
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 Delsey Helium Fusion 30 Carry on Expandable Suiter Trolley Black US $69.99
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 Delsey Helium Fusion Lite 20 25 Expandable Suiter Trolley US $19.99
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 Delsey Helium Fusion Lite 20 Expandable 25 Suiter Trolley US $22.00
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 Delsey Helium Fusion Lite 20 29 US $14.99
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 Delsey Helium Breeze 30 26in Expandable 4 Wheel Trolley13247 US $139.99
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 Delsey Luggage Helium Breeze 30 Wheeled 30 Expandable Spinner Trolley Black US $169.99
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 Delsey 22874Bd 21 carryon carry on luggage US $41.39
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 Delsey Luggage Helium Breeze Garment Bag model 12653BK US $42.74
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 Delsey Helium Fusion 30 29 Expandable Suiter Trolley Wheeled Luggage 27879 BK US $117.97
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 Delsey Helium Fusion Lite 20 Luggage 21 Wheeled Carry On Bag Suiter Trolley 2 US $76.74
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 Delsey Helium Pilot 17877 Expandable Suiter Trolley US $179.99
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 Delsey Helium Superlite Rolling Wheeled Expandable Garment Bag Luggage Black NWT US $152.99
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 Delsey Helium Xpert Lite 4 Wheel Spinner Carry On Suiter Trolley Luggage Black US $152.99
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 Delsey Helium Fusion Lite 29 each Expandable Suiter Trolley Blue US $99.99
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 Delsey Helium Xpert Lite 25 Spinner 4 Wheel Suiter Trolley Luggage Black NWT US $186.99
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 Delsey Helium Xpert Lite Spinner Carry On Bag Luggage US $152.99
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 Delsey Helium Fusion 30 Carry on Exp Suiter Trolley US $84.99
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 Delsey Helium Superlite Carry On Expandable Luggage Bag US $110.49
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 Delsey Helium Fusion Lite 29 each Expandable Suiter Trolley Black US $99.99
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 Delsey Helium Fusion 30 Carry On Expandable Suiter Trolley Suitacase 27874 US $84.99
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 Delsey Helium Fusion Lite 20 29 Expandable Suiter Trolley 22879 US $119.99
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 Delsey Helium Fusion Lite Carry on Expandable Suiter Trolley Blue US $69.99
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 Delsey Helium Contour EZ Glide 4 Piece Luggage Set 374 US $449.96
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 New with tags Delsey 17877BK 26 black suiter with 4 spinner wheels US $99.95
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 Delsey Pro H Lite Red 26in Expandable Suiter Trolley Luggage Suitcase US $69.99
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 Delsey Helium Fusion 30 29 Expandable Suiter Trolley Wheeled Luggage 27879 BD US $117.97
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 Delsey Helium Fusion 30 25 Expandable Suiter Trolley Wheeled Luggage 27877 BK US $109.97
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 Delsey Helium Fusion 30 25 Expandable Suiter Trolley Wheeled Luggage 27877 BD US $109.97
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 Delsey Helium Breeze 30 26 Expandable 4 Wheel Trolley Black 13247BK US $152.99
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 Delsey 29 Helium Superlite Rolling UprightBlack NEW WITH TAG Retail$360 US $115.89
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 Delsey Helium Fusion 30 Trolley Garment Bag Black US $135.99
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 Delsey Helium Fusion Lite 20 29 Wheeled Rolling Suiter Trolley Luggage Black US $108.79
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 Delsey Helium Xpert Lite 29 Spinner Suiter Luggage US $203.99
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 Delsey Helium Lightweight Extreme 25 Wheeled Luggage US $170.00
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 Delsey Helium Fusion Lite 20 29 Expandable Suiter Blue 22879BD US $139.99
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 Delsey Helium Breeze 21 Carry on Expandable Suiter Trolley 12374 US $35.00
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 Delsey Helium Fusion Lite 20 25 Expandable Suiter Black 22877BK US $129.99
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 Delsey Helium Superlite 25 Wheeled Expandable Luggage US $135.99
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 Delsey Helium Fusion Lite 25 each Expandable Suiter Trolley Black US $79.99
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 Delsey Helium Fusion Lite 20 29 Expandable Suiter Black 22879BK US $145.95
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 Delsey Helium Fusion Lite 20 25 Expandable Suiter Blue 22877BD US $99.99
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 NEW Delsey Helium Pilot 20 29 Expandable Suiter Trol US $263.99
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 NEW Delsey Helium Pilot 20 25 Expandable Suiter Trol US $237.99
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 Delsey Helium Breeze 30 30 Expandable 4 Wheel Trolley US $159.99
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 Delsey Helium Fusion Lite 22 Expandable Carry On NEW US $95.00
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 Delsey 29 SuitCase HELIUM CONTOUR EZ GLIDE Spinner Upright New Retail$340 US $99.89
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 Delsey 22877 Helium Fusion Lite 20 25 Exp Suiter US $99.99
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 DELSEY HELIUM FUSION LITE 20 EXP 21 SUITER TROLLEY NW US $120.00
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 DELSEY HELIUM FUSION LITE 20 EXP 29 SUITER TROLLEY NW US $179.99
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 Delsey Helium Alliance 3 Piece Luggage Set Black US $207.99
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 Delsey Helium Pilot 20 Luggage 29 Expandable Suiter US $263.49
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 Delsey Helium Pilot 20 Luggage 25 Expandable Suiter US $237.99
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 Delsey Helium Pilot 20 Luggage 215 Wheeled Roling Carry on Bag 22 US $186.99
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 Delsey Helium Pilot 20 Luggage 215 Wheeled Rolling Carry on Bag 22 US $186.99
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 Delsey Helium Superlite Carry On Bag Wheeled Luggage US $110.49
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 NEW DELSEY HELIUM APEX 25 EXPANDABLE WHEELED LUGGAGE US $99.95
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 Delsey Helium Fusion Lite 20 29 Expandable Suitcase US $49.99
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 Delsey Helium Fusion Lite 20 Expandable Upright 29 Black RETAIL$260 US $69.89
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 Delsey Helium Pilot 20 29 Expandable Suiter Trolley 17879 US $204.99
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 Delsey Helium Fusion 30 25 Exp Suiter Trolley US $110.49
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 Delsey Helium Fusion 30 29 Exp Suiter Trolley US $118.99
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 Delsey Travel Luggage Case Soft Bag Carry On Black Wheel Expandable Large NEW US $155.51
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 Delsey Helium Fusion 30 29 Exp Suiter Trolley Blue US $118.99
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 Delsey Helium Fusion 30 25 Exp Suiter Trolley Blue US $110.49
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 Delsey Helium Breeze 30 Carry on Expandable 4 Wheel Trolley Black US $127.49
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 NEW Delsey Helium Pilot 20 Carry on Expandable Suiter US $186.99
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 Delsey Fusion Lite 20 29 Inch Suiter Trolley Bag Black US $118.99
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 Delsey Fusion Lite 20 29 Inch Suiter Trolley Bag Blue US $118.99
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 Delsey Fusion Lite 20 25 Inch Suiter Trolley Bag Black US $110.49
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 Delsey Fusion Lite 20 25 Inch Suiter Trolley Bag Blue US $110.49
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 Delsey Helium Fusion 21 Carry on Expandable Suiter Trolley Luggage in Black 2222 US $94.95
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 Delsey Helium Superlite 25 Inch Expandable Trolley Suitcase Mocha Brown US $115.99
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 Delsey 22 in Expandable Carry On Trolley Suitcase Black US $89.99
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 Delsey Helium SuperLite 21 Rolling Upright Suitcase Gray US $79.99
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 Delsey Helium SuperLite 29 Rolling Upright Suitcase Purple US $99.99
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 Delsey Helium SuperLite 29 Rolling Upright Suitcase Gray US $99.99
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 Delsey Helium Superlite 29 Inch Expandable Trolley Suitcase Black US $149.99
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What's the volume of this gas (physics - thermodynamics)?
"An expandable cube, initially 21cm on each side, contains 3g of helium at 20 degrees C. 1500 J of heat energy are transferred to this gas. What is the final volume if the process is at constant pressure?"
I'm so lost.... any explanation is appreciated 
For an ideal monatomic gas, molar cp = 2.5R = 20.7861805 J/mol-K
n = 3/4 = 0.75 mol
T1 = 293.15 K; V1 = 0.21^3 m^3; Q = 1500 J
T2 = T1+Q/(n*cp) = 389.36777 K
In an isobaric process, V2/V1 = T2/T1
V2/V1 = 389.36777/293.15 ==> V2 = 0.21^3*389.36777/293.15 = 0.012300648 m^3
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