Question 3: thermodynamic (20 marks) 3.1. a 1.435g of naphthalene (ch) was burned in constant volume bomb calorimeter. consequently temperature of the water rose from 20.17â°c to 25.84â°c. if the mass of water surrounding the calorimeter was exactly 2.0 x 10kg and the heat capacity of the bob calorimeter was 1.80 kj/â°c, calculate the molar heat of reaction (combustion) in kj of naphthalene. (10) 3.2 propane (ch) has a normal boiling point of -42.0â°c and a heat of vaporization (hvapo) of 19.04kj/mol. what is the vapor pressure of propane at 25.0â°c? (5) 3.3 one of the methods for synthesizing methanol (ch30h) involves reacting co with h2. the equilibrium is co2h2 () ch2oh(a). at 427â°c a mixture of co, h, and ch. oh having the following partial pressures; pco= 2.0 x 10'atm, ph2= 1.0x10â° atm and pch. oh = 1.0 x 10â°. for this reaction grook = 13.5 kj. determine whether the system is at equilibrium? (5) total marks: 109 end

answer: option (b) is the correct answer.

explanation:

a covalent bond is formed by sharing of electrons. whereas polarity arises due to difference in electronegativity of two atoms.

therefore, more is the electronegativity of an atom which combines with the titanium, more readily it will induce a partial positive and negative charge.

thus, out of the given options fluorine is most electronegative and has an incomplete octet. therefore, it will readily combine with titanium to share the electrons and complete its octet.  

in the given question, the partial pressure is calculated by using the ideal gas equation, that is, pv = nrt

here, p is pressure, v is volume = 25 l, n is number of moles = 0.0104 moles, r is gas constant = -0.0821 l.atm / mol.k

t is temperature = 273 k

p = nrt / v

p = (0.0104 mol × 0.0821 l.atm / mol.k × 273 k) / 25 l

= 0.0093 atm

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.