1.a) If Î”E > 0 then energy is being absorbed by the system. True False 1.b) If Î”Esystem is...

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Chemistry

1.a) If Î”E > 0 then energy is being absorbed by thesystem.
True
False
1.b) If Î”E_system is positive thenÎ”E_surrounding must be:
negative
none of these
positive
zero
1.c) Consider the following chemical equation and calculate howmuch heat is released when 77.90 grams ofC₂H₆ reacts.

2 C₂H₆ + 7 O₂ --> 4CO₂ + 6H₂OÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Î”H= -385 kJ

- answer should read out to one place after the decimal
- do not include units
1.d) A 27.4 g cube of copper initially at 74.6 ÂºC is submergedinto a cup filled with 121.4 grams of water at 13.6 ÂºC. Determinethe final temperature of both substances at thermalequilibrium.
HINTS:Â Â Â Â Â Â Specific heatof copper = 0.385 J/g Ã— ÂºC Â Â Specific heat of water =4.184 J/g Ã— ÂºC
- your answer should contain four significantfigures.
1.e) Calculate the heat (in kJ) associated if 0.0107 kg ofCH₄ was used for the reaction:

CH₄(g) + 2O₂(g)Â Â -->CO₂(g) + 2H₂O(g)Î”H_rxn = -890 kJ

-report answer using three sig figs

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3.9 Ratings (683 Votes)

1 a Here energy of product is more than energy of reactant That means energy is absorbed during the reaction The statement is true b The answer is negative c Molar mass of C2H6 is See Answer

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		negative
		none of these
		positive
		zero 1.c) Consider the following chemical equation and calculate howmuch heat is released when 77.90 grams ofC₂H₆ reacts. 2 C₂H₆ + 7 O₂ --> 4CO₂ + 6H₂OÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Î”H= -385 kJ - answer should read out to one place after the decimal - do not include units 1.d) A 27.4 g cube of copper initially at 74.6 ÂºC is submergedinto a cup filled with 121.4 grams of water at 13.6 ÂºC. Determinethe final temperature of both substances at thermalequilibrium. HINTS:Â Â Â Â Â Â Specific heatof copper = 0.385 J/g Ã— ÂºC Â Â Specific heat of water =4.184 J/g Ã— ÂºC - your answer should contain four significantfigures. 1.e) Calculate the heat (in kJ) associated if 0.0107 kg ofCH₄ was used for the reaction: CH₄(g) + 2O₂(g)Â Â -->CO₂(g) + 2H₂O(g)Î”H_rxn = -890 kJ -report answer using three sig figs