Description : What is combustion heat or combustion enthalpy ?
Last Answer : The change in enthalpy that occurs when a basic or compound substance is completely burned in oxygen at a certain temperature and 1 atm pressure is called combustion heat or combustion enthalpy. The change ... combustion heat or proof combustion enthalpy of that substance. It is expressed by H ° C.
Description : Which of the following equations corresponds to the enthalpy of combustion at `298K`?
Last Answer : Which of the following equations corresponds to the enthalpy of combustion at `298K`? A. `C_(2)H_(6)(g)+7//2O_(2 ... (2)(g)rarr 4CO_(2)(g)+6H_(2)O(l)`
Description : Given standard enthalpy of formation of `CO(-110 "KJ mol"^(-1))` and `CO_(2)(-394 "KJ mol"^(-1))`. The heat of combustion when one mole of graphite bu
Last Answer : Given standard enthalpy of formation of `CO(-110 "KJ mol"^(-1))` and `CO_(2)(-394 "KJ mol"^(-1))`. The heat ... B. `-284` KJ C. `-394` KJ D. `-504` KJ
Description : The enthalpy of combustion of `H_(2)` , cyclohexene `(C_(6)H_(10))` and cyclohexane `(C_(6)H_(12))` are `-241` , `-3800` and `-3920KJ` per mol respect
Last Answer : The enthalpy of combustion of `H_(2)` , cyclohexene `(C_(6)H_(10))` and cyclohexane `(C_(6)H_(12))` are `-241 ... "KJ mol"^(-1)` D. `242 "KJ mol^(-1)`
Description : The enthalpy change when ammonia gas is dissolved in water is called the heat of (A) Solution (B) Formation (C) Dilution (D) Combustion
Last Answer : (A) Solution
Description : In a boiler enthalpy of water supplied was 2000 kJ/kg. Enthalpy being added by fuel combustion is 3200 kJ/kg. Using first law of thermodynamics, find amount of heat supplied if steam generation rate is 10 tons per hour.
Last Answer : Heat supplied Q = m (h2-h1) …….(Steady flow energy equation for boiler) ; h2=3200 KJ/kg h1=2000 KJ/kg m = 10 Tons /hour = (10 x 1000)/3600 kg/sec = 2.77 Kg/sec Q = 2.77(3200-2000) = 3324 KJ/sec heat supplied for 10 Tons/hr steam generation
Description : Entropy is the measure of: a. The internal energy of a gas b. The heat capacity of a substance c. Randomness or disorder d. The change of enthalpy of a system
Last Answer : Randomness or disorder
Description : Sum of the internal energy of a substance and the product of pressure and volume. a. Specific Heat b. Specific Gravity c. Isolated System d. Enthalpy
Last Answer : Enthalpy
Description : _____ is that property of a substance which remains constant if no heat enters or leaves the substance, while it does work or alters its volume, but which increases or diminishes should a small amount of heat enter or leave. a. Entrophy b. Enthalpy c. Specific Heat d. None of the above
Last Answer : Entrophy
Description : What refers to the measure of the disorder present in a given substance or system? A. Enthalpy B. Entropy C. Heat capacity D. Molar heat
Last Answer : Entropy
Description : If heat be exchanged in a reversible manner, which of the following property of the working substance will change accordingly (a) temperature (b) enthalpy (c) internal energy (d) entropy (e) all of the above.
Last Answer : Answer : d
Description : Total heat of a substance is also known as (a) internal energy (b) entropy (c) thermal capacity (d) enthalpy (e) thermal conductance.
Description : A combustion reaction occurs when a substance, usually containing carbon reacts with to produce energy in the form of heat and light?
Last Answer : Oxygen.
Description : An organic compound contain 69% carbon and 4.8% hydrogen, the remaining being oxygen. Calculate the masses of carbon dioxide and water produced when 0.20g of this substance is subjected to complete combustion.
Last Answer : Calculation of mass of CO2 produced: Mass of compound =0.20g %C =12 x C 69=12*mass of CO2 formed*100/44*0.2 Mass of CO2 formed =69*44*.2/12*100 = 0.506g Similarly, % H =2* mass of H2Oformed*100/18* ... compound 4.8=2* mass of H2Oformed*100/18* 0.2 Mass of H2Oformed =4.8*18*0.2/2*100 =0.0864g
Description : Fuel' can be defined as a substance which produces heat by (A) Combustion (B) Nuclear fission (C) Nuclear fusion (D) All (A), (B) & (C)
Last Answer : (D) All (A), (B) & (C
Description : _________ is a substance which undergoes spontaneous combustion. a) wood b)coal c)sodium d)cow dung cakes
Last Answer : c)sodium
Description : A mystical substance supposedly released during combustion was called: w) thermal flax x) ether y) caloric z) phlogiston (pron: flow-gis-ton)
Last Answer : ANSWER: Z -- PHLOGISTON