271 11 A reaction releases 0.65 kcal of energy, if the increase in temperature i

Question

271 11 A reaction releases 0.65 kcal of energy, if the increase in temperature is 2.0°C, what is the volume of water in calorimeter? 12 Write the rate law for complete combustion of pentane; pentane and oxygen are the only two reactants and carbon dioxide and water are the only two products. 13 Explain the difference between rate constant and the equilibrium constant. Also explain the difference between physical equilibrium and a chemical equilibrium. 14 Write the equilibrium constant for the equilibrium reaction of nitrogen with hydrogen. Nitrogen and hydrogen combine to form ammonia. If the concentration of Hydrogen is 9.2x10-2 M, the concentration of Nitrogen is 7.1x10-1M and concentration of NH3 is 1.8x10-4M what is the numerical value of the equilibrium constant? 15 Explain LeChatelier's Principle and how it is employed in a buffer solution? 16 Write the equilibrium reaction for formation of nitrogen monoxide. The reactants are oxygen and nitrogen and product is nitrogen monoxide. Explain how decreasing the pressure would effect the reaction?

Explanation / Answer

Ans 11 :

This can be calculated using the formula :

Q = m. c. delta T

where m is mass of water

c is specific heat = 0.001 kcal / goC

So putting all the values we get :

0.65 = m x 0.001 x 2

m = 325 g

Since the density of water is 1g/mL , so the volume of water in the calorimeter will be 325 mL

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