B
Bob L
Guest
I never had a lecture on this material nor did the I understand it when I read the material. I just need understanding this.
1. a metal sameple weighing 45.2g and at a temperature of 100.0 C was placed in 38.6g of water in a calorimeter at 25.2 C. At equilibrium the temperature of the water and metal was 33.0 C
A. What was detal t for the metal?
B. How much heat flowed into the water?
C. Taking the specific heat of water to be 4.18 J/g C, calculate the specific heat of the metal?
D. what is the approximate molar mass of the metal?
2. When 2.0g of NaOH were dissolved in 49.0g water in a calorimeter at 24.0 C the temperature of the solution went up to 34.5C
A. is this solution reaction exothermic?__________ why?
B. Calculate qh2o
C. Find deltaH for the reaction as it occureed in the calorimeter.
D. Find deltaH for the solution of 1.00g NaOH in water
E. Find deltaH for the soultion of 1 mole NaOH in water
F. Given that NaOH exist as NA and OH ions in solution, write the equation for the reaction that occurs when NaOH is dissolved in water
G.Given the following heats of formation, deltaH supcript f, in kJ per mole, as obtained from a table of delta H upscript f data, calculate delta H for the reaction in Part f. Compare your answer with the result you obtained in Part e.
NaOH(s), --425.6; Na, --240.1; OH, --230.0
1. a metal sameple weighing 45.2g and at a temperature of 100.0 C was placed in 38.6g of water in a calorimeter at 25.2 C. At equilibrium the temperature of the water and metal was 33.0 C
A. What was detal t for the metal?
B. How much heat flowed into the water?
C. Taking the specific heat of water to be 4.18 J/g C, calculate the specific heat of the metal?
D. what is the approximate molar mass of the metal?
2. When 2.0g of NaOH were dissolved in 49.0g water in a calorimeter at 24.0 C the temperature of the solution went up to 34.5C
A. is this solution reaction exothermic?__________ why?
B. Calculate qh2o
C. Find deltaH for the reaction as it occureed in the calorimeter.
D. Find deltaH for the solution of 1.00g NaOH in water
E. Find deltaH for the soultion of 1 mole NaOH in water
F. Given that NaOH exist as NA and OH ions in solution, write the equation for the reaction that occurs when NaOH is dissolved in water
G.Given the following heats of formation, deltaH supcript f, in kJ per mole, as obtained from a table of delta H upscript f data, calculate delta H for the reaction in Part f. Compare your answer with the result you obtained in Part e.
NaOH(s), --425.6; Na, --240.1; OH, --230.0