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turquoiseworm20Lv1

11 Dec 2019

Calculate the standard entropy change for the reaction

2Mg(s)+O₂(g)→ 2MgO(s)

using the data from the following table:

Substance (kJ/mol) (kJ/mol) [J/(K/mol)]

Mg(s) 0.00 0.00 32.70

O2(g) 0.00 0.00 205.0

MgO(s) -602.0 -569.6 27.00

Express your answer to four significant figures and include the appropriate units.

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1 Dec 2020

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P4(g)+5O2(g)?P4O10(s)

using the data from the following table:

Substance	?H?f (kJ/mol)	?G?f (kJ/mol)	S?[J/(K?mol)]
P4(g)	58.90	24.50	279.9
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Express your answer to foursignificant figures and include the appropriate units.

C6H5OH(s) + 7O2(g) => 6CO2(g) + 3H2O(l)

When a 2.000-gram sample of pure phenol is completely burnedaccording to the equation above, 64.98 kilojoules of heat isreleased. Use the information in the table below to answer thequestions that follow:

Substance	Standard Heat of Formation, , Delta H Degrees, at 25 degreesCelsius (kJ/mol)	Absolute Entropy, S degrees, at 25 degrees Celsius (J/mol-K)
C(graphite)	0.00	5.69
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O2 (g)	0.00	205.0
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(b) Calculate the standard heat of formation, ÎHdegrees_f of phenol in kilojoules per mole at 25degrees celsius

Problem 1 - Energy, q, w, Enthalpy, and Stoichiometry Consider the following reaction: 2Mg(s)+O2(g)>>2MgO(s)?H = -1204kJ 1) Is this reaction exothermic or endothermic? 2) Calculate the amount of heat transferred when 2.5 g of Mg(s) reacts at constant pressure. Express your answer using two significant figures. 3)How many grams of MgO are produced during an enthalpy change of -97.0 kJ ? 4)How many kilojoules of heat are absorbed when 7.90 g of MgO(s) is decomposed into Mg(s) and O2(g) at constant pressure?

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Substance	(kJ/mol)	(kJ/mol)	[J/(K/mol)]
Mg(s)	0.00	0.00	32.70
O2(g)	0.00	0.00	205.0
MgO(s)	-602.0	-569.6	27.00