Assignment Task 

 

1. A substance has a molar heat of combustion of -810.4 kJimol. When 0.285 mot of the substance is burned in a calorimeter containing 8.60 kg of water. what is the increase in water temperature?

2. This is a tricky one. but give it a shot! What mass of ammonium nitrate is required to lower the temperature of 400 mL of water from 25°C to 1°C? The .1.,,ifor ammonium nitrate is 34 kJ/mol.

3. The production of iron and carbon dioxide from iron(II) oxide and carbon monoxide is an exothermic reaction. How much energy is produced when 3.4 mot of Fe20) react with an excess of CO? 

Fe20) (s) + 3C0 (g) 2Fe 3CO2 (g) + 26.3 kJ 
 

4. Calculate the molar heat of reaction for carbon in the following reaction: 3C (s) + 2Fe203 (s)+ 466 kJ — 4Fe (s) + 3CO2 (g) 
 

5. The heat of reaction for the following is -126 kJ. How much heat (kJ) would be evolved to the surroundings by the reaction of 25.0 g of Na202 with water? 2Na202 (s) 2H20 (I) — 4.. (s) + 02 (9) Istr% 
 

6. The heat of reaction for the following is -336 kJ. Determine the amount of heat exchanged with the surroundings when 23.0 g of HCI is formed.

(g) + 3Cl2(g) CHCI, + 3HCI 
 

7. If the molar heat of fusion of sodium is 2.63 kJ/mot. how much energy is needed to melt 180 g of solid sodium at its melting point? 
 

8. There are several steps to this question... Hang in there. you can do It! Calculate how much energy is required to heat 50 g of mercury from -50°C to 750°C. 

2.33 kJ/mot = 0.141 J/g-C = 0.104 J/g'C boiling point = 357°C

 

 

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  • Posted on : March 19th, 2019

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