Chem 201 Chapter 8 Worksheet Define the following terms: a) enthalpy - b) internal energy c) state function d) Hess's law e) calorimetry f) thermal equilibrium A 125.6g piece of gold (Au) is submerged in a calorimeter containing 90.0g of H_(2)O, which is initially at 28.0 deg C. The gold and water reach thermal equilibrium at 36.4 deg C. C_(sH2O )=

Question

Chem 201 Chapter 8 Worksheet Define the following terms: a) enthalpy - b) internal energy c) state function d) Hess's law e) calorimetry f) thermal equilibrium A

125.6g

piece of gold

(Au)

is submerged in a calorimeter containing

90.0g

of

H_(2)O

, which is initially at

28.0\deg C

. The gold and water reach thermal equilibrium at

36.4\deg C

.

C_(sH2O )=4.184(J)/(g^(**0)C),C_(sAu )=0.129

(J)/(g^(**0)C)

. What is the initial temperature of the gold? Calculate

\Delta H_(rxn)

of the following reactions using the standard enthalpy of formation values below:

Ca(g)\Delta H_(i)^(0)=178.2k(J)/(m)ol,CaO(s)\Delta H_(i)^(0)=-634.9k(J)/(m)ol,H_(2)O(I)\Delta H_(i)^(0)=-285.8kJ,Ca(OH)_(2)(s)\Delta H_(i)^(0)=-985.2

k(J)/(m)ol,SO4(s)\Delta H_(i)^(0)=-296.8k(J)/(m)ol,CaSO_(4)^(**)2H_(2)O(s)\Delta H_(i)^(0)=-2022.63k(J)/(m)ol

. a)

2Ca(g)+O_(2)(g)->2CaO(s)

b)

Ca(s)+2H_(2)O(I)-Ca(OH)_(2)(s)+H_(2)(g)

c)

Ca(s)+SO_(4)(s)+H_(2)O(l)-CaSO_(4)**2H_(2)O(s)

How many grams of

HCl

produced would require

6403kJ

of heat in the reaction below:

3MgCl_(2)(aq)+2H_(3)P(aq)->Mg_(3)P_(2)(s)+6HCl(aq),\Delta H^(0)=157.2k(J)/(m)ol

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