The specific heat of copper is 0.385 J/(g°C). If 34.2 g of copper, initially at
ID: 961733 • Letter: T
Question
The specific heat of copper is 0.385 J/(g°C). If 34.2 g of copper, initially at 25°C, absorbs 4.689 kJ, what will be the final temperature of the copper?
a. 25.4°C b. 27.8°C c. 356°C d. 381°C
A chemical reaction causes the temperature of 1.0 x 102 g of water in a calorimeter to rise from 25°C to 40°C. The specific heat of water is 4.184 J/(g°C). What is the heat of reaction, qP?
a. -0.31 kJ b. -0.75 kJ c. -1.5 kJ d. -6.3 kJ 13. The standard enthalpy of formation for water vapor is H°f = -241.8 kJ/mol.
Write out the standard formation reaction for water vapor in terms of a balanced thermochemical equation.
a. H2O (l) H2O (g) H°f = -241.8 kJ/mol b. H2O (g) H2 (g) + ½ O2 (g) H°f = -241.8 kJ/mol c. 2 H2 (g) + O2 (g) 2 H2O (g H°f = -241.8 kJ/mol d. H2 (g) + ½ O2 (g) H2O (g) H°f = -241.8 kJ/mol
Please show work
Explanation / Answer
The specific heat of copper is 0.385 J/(g°C). If 34.2 g of copper, initially at 25°C, absorbs 4.689 kJ, what will be the final temperature of the copper?
a. 25.4°C b. 27.8°C c. 356°C d. 381°C
Answer- q = mcat
4689 J = (34.2)(0.385 J/gC)(X-25)
356 = X-25
X = 381
d. 381°C
A chemical reaction causes the temperature of 1.0 x 102 g of water in a calorimeter to rise from 25°C to 40°C. The specific heat of water is 4.184 J/(g°C). What is the heat of reaction, qP?
a. -0.31 kJ b. -0.75 kJ c. -1.5 kJ d. -6.3 kJ 13. The standard enthalpy of formation for water vapor is H°f = -241.8 kJ/mol.
Answer- q = (4.18 J g-1 K-1)*(100g)*(313-298 K)
q = 6.27 kj
= -6.3 kj
Write out the standard formation reaction for water vapor in terms of a balanced thermochemical equation.
a. H2O (l) H2O (g) H°f = -241.8 kJ/mol b. H2O (g) H2 (g) + ½ O2 (g) H°f = -241.8 kJ/mol c. 2 H2 (g) + O2 (g) 2 H2O (g H°f = -241.8 kJ/mol d. H2 (g) + ½ O2 (g) H2O (g) H°f = -241.8 kJ/mol
Answer-
d. H2 (g) + ½ O2 (g) H2O (g) H°f = -241.8 kJ/mol
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