Calculate q when 286 g of water is heated from 220c

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Exam 2 1307 s18.pdf

Calculate q when 286 g of water is heated from 220C to 783C A674 kJ B161 10 3 from CHEM 1307 at Texas Tech University

20 )   Cold packs , whose temperatures are lowered when ammonium nitrate dissolves in water , are carried by athletic trainers when transporting ice is not possible . Which of the following is true of this reaction ?
A ) Δ H = 0 , since cold packs are sealed
B ) Δ H < 0 , process is endothermic
C ) Δ H > 0 , process is endothermic
D ) Δ H > 0 , process is exothermic
E ) Δ H < 0 , process is exothermic
21 )   Calculate q when 28.6 g of water is heated from 22.0 ° C to 78.3 ° C.
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22 )   The combustion of glucose ( C 6 H 12 O 6 ) with oxygen gas produces carbon dioxide and water . This process releases 2803 kJ per mole of glucose . When 3.00 mol of oxygen react in this way with glucose , what is the energy release in kcal ? ( Hint : Write a balanced equation for the combustion process . )
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23 )   Calcium hydroxide , which reacts with carbon dioxide to form calcium carbonate , was used by the ancient Romans as mortar in stone structures . The reaction for this process is 23 ) Ca ( OH ) 2 ( s ) + CO 2 ( g ) → CaCO 3 ( s ) + H 2 O ( g ) Δ H = – 69.1 kJ What is the enthalpy change if 3.8 mol of calcium carbonate is formed ?
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24 )   Use Hess 's Law to calculate the enthalpy change for the reaction WO 3 ( s ) + 3H 2 ( g ) → W( s ) + 3H 2 O ( g ) from the following data : 2 W ( s ) + 3O 2 ( g ) → 2 WO 3 ( s ) Δ H = – 1685.4 kJ 24 ) 2H 2 ( g ) + O 2 ( g ) → 2H 2 O ( g ) Δ H = – 477.84 kJ
A ) 364.9 kJ
B ) 1207.6 k J
C ) 252.9 kJ
D ) 125.9 kJ
E ) None of these choices are correct .
25 )   Select the arrangement of electromagnetic radiation which starts with the lowest energy and increases to greatest energy .
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26 )   The AM station KBOR plays your favorite music from the 20s and 30s at 1290 k Hz . Find the wavelength of these waves .
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27 )   Infrared radiation from the sun has a wavelength of 6200 nm . Calculate the energy of one photon of that radiation .
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28 )   The size of an atomic orbital is associated with
A ) the angular momentum quantum number (
l ) 
Answer:  l )   .
21)Calculate q when 28.6 g of water is heated from 22.0°C to 78.3°C. A)6.74 kJ B)1.61 × 103 kJ C)1.61 kJ D)0.385 kJ E)9.37 kJ
21)22)The combustion of glucose (C6H12O6) with oxygen gas produces carbon dioxide and water. This process releases 2803 kJ per mole of glucose. When 3.00 mol of oxygen react in this way with glucose, what is the energy release in kcal? (Hint: Write a balanced equation for the combustion process.)
22)23)Calcium hydroxide, which reacts with carbon dioxide to form calcium carbonate, was used by the ancient Romans as mortar in stone structures. The reaction for this process is 23)Ca(OH)2(s) + CO2(g) CaCO3(s) + H2O(g) ΔH = –69.1 kJ What is the enthalpy change if 3.8 mol of calcium carbonate is formed?
A524)Use Hess's Law to calculate the enthalpy change for the reaction WO3(s) + 3H2(g) W(s) + 3H2O(gfrom the following data: 2W(s) + 3O2(g) 2WO3(s) ΔH = –1685.4 kJ 2H2(g) + O2(g) 2H2O(g) ΔH = –477.84 kJ 24))
25)Select the arrangement of electromagnetic radiation which starts with the lowest energy and increases to greatest energy. A)infrared, ultraviolet, radio, gamma rays B)radio, ultraviolet, infrared, gamma rays C)radio, infrared, ultraviolet, gamma rays D)gamma rays, infrared, radio, ultraviolet E)gamma rays, ultraviolet, infrared, radio
25)

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