Chemistry - Fill in the Blanks Type Questions Chemical Energetics

1. The total energy of one mole of an ideal monatomic gas at 27°C is __________ calories. (JEE 1984)

Answer (3/2)RT = (1.5 mol)[1.987 cal/ (K mol.)](300 K) = 894.15 cal.

2. A system is said to be ___________ , if it can neither exchange matter nor energy with the surroundings. (JEE 1993)

Answer: isolated

3. The heat content of the products is more than that of the reactants in an _____________ reaction. (JEE 1993)

Answer: endothermic

4. When Fe (solid) is dissolved in acqueous hydrochloric acid in a closed vessel, the work done is _________________ . (JEE 1997)

Answer: zero

5. Enthalpy is an ____________ property. (JEE 1997)

Answer: extensive property.

It depends on mass of the substance