Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
AP EAMCET201920 Apr 2019Morning ShiftChemistryThermodynamics (C)Actual

(6 ~g ) of graphite is burnt in a bomb calorimeter at (25^ C ) and (1 ~atm ) pressure. The temperature of water increased from (25^ C ) to (31^ C ). If ( H ) of this reaction is (-248 ~kJ ) mol, find out ( C _V ) (in ( kJ K ⁻¹ ) ) of bomb calorimeter.

Options

  1. A20.667
  2. B41.33
  3. C1488
  4. D0.145

Correct answer

A. 20.667

Step-by-step solution

Weight of graphite (=6 ~g ) In bomb calorimeter volume is constant Hence, (W=0 ), (work done) ( H= U=q (Heat) ) Given, ( H=-248 ~kJ / mol ) For, (12 ~g ) of graphite required energy is (248 ~kJ / mol ). For, (6 ~g ) of graphite, it will be (= 248 6 12 ) ( aligned aligned From, q & =C_V T 248 6 12 & =C_V (31-25) C_V & = 248 2 6 =20.6 ~kJ / K aligned aligned )

Practice Thermodynamics (C) on Quantrex Academy →

More from Thermodynamics (C)

Identify the INCORRECT statement 2026The standard enthalpies of formation of CH₄ (g), CO₂ (g) and H₂ O(l) are -74.8 kJ mol ⁻¹ , -393.5 kJ mol ⁻¹ and -285.8 kJ mol ⁻¹ respectively. Then the enthalpy change for the give 2026For an ideal gas undergoing an isothermal change, there is 2026Ozone is formed by the reaction O _ 2(g) + O _ (g) O _ 3(g) , H = -107.2 kJ . Given O=O bond energy is 498.0 kJ mol ⁻¹ , the average bond energy of ozone is: 2026H and S for a reaction are 35.5 kJ mol ⁻¹ and 83.6 J K ⁻¹ respectively. Assuming that H and S do not vary with temperature, the reaction is spontaneous when: 2026The heat of combustion of carbon to CO ₂ is -393.5 kJ mol ⁻¹ . The heat released on the formation of 35.2 g of CO ₂ by combustion of C is: 20265 moles of a gas is allowed to pass through a series of changes as shown in the graph, in a cyclic process. The processes C A , B C and A B respectively are 20251 mole of an ideal gas is allowed to expand isothermally and reversibly from 1 L to 5 L at 300 K. The change in enthalpy (in kJ ) is ( R =8.3 ~J ~K ⁻¹ ~mol ⁻¹ ) 2025 Full Thermodynamics (C) list All AP EAMCET PYQs