Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
The standard enthalpy of formation (ΔH°f) is the enthalpy change that occurs when exactly 1 mol of a compound is formed from its constituent elements under standard conditions. The standard conditions are 1 atm pressure, a temperature of 25 °C, and all the species present at a concentration of 1 M. A "standard enthalpies of formation table" containing ΔH°f values might look something like this:
Substance
ΔH°f
H(g)
218 kJ/mol
H2(g)
0 kJ/mol
Ca(s)
Ca2+(aq)
-543kJ/mol
C(g)
71 kJ/mol
C(s)
N(g)
473 kJ/mol
O2(g)
O(g)
249 kJ/mol
S2(g)
129 kJ/mol
What is the balanced chemical equation for the reaction used to calculate ΔH°f of CaCO3(s)?
If fractional coefficients are required, enter them as a fraction (i.e. 1/3). Indicate the physical states using the abbreviation (s), (l), or (g) for solid, liquid, or gas, respectively without indicating allotropes. Use (aq) for aqueous solution.
Express your answer as a chemical equation.
Marble (calcium carbonate) reacts with hydrochloric acid solution to form calcium chloride solution, water, and carbon dioxide. What is the percent yield of carbon dioxide
This procedure is potentially very lucrative because, after an initial extraction of energy from the groin, no fossil fuels would be required to keep the device running indefinitely. Would you invest in this idea? State your conclusion clearly and..
What volume of an organic solvent must be used to effect 90% seperation in one extraction when only 2.7 g of a certain compound dissolves 100 ml of water? (K=15).
Phosphorus-32 has a half-life of 14.0 days . Starting with 2.00 g of P^32, how many grams will remain after 70.0 days?
When a system is in a state of chemical equilibrium, a state of apparent rest, is anything going on at the molecular
A sample of C2H2 contains 3.02 moles of C (12.0 g/mol). How many moles of C2H2 (26.04 g/mol) are present
Calculate the mass of propylene glycol that must be added to 0.360 of water to reduce the vapor pressure by 2.88 torr at 40°C (Pressure of H2O is 55.3 torr at 40°C ).
Assume in state A, V=4.00dm&3, p=1.00atm, t=300K, Va=10Vb, Pc/Pb=5 and Cp,m= 7/2R. Determine the change in entropy of the system and the surroundings for each step of the cycle.
calculate the number of moles of magnetic iron oxide produced.
It required 50.00 mL of 0.1565 M KMnO4 to titrate 2.878 g of the solution containing hydrogen peroxide. What was the mass percentage of H2O2 in the solution
Calculate the percentage of He atoms at 100oC which have speeds in the range between 1200 m/s and 1300 m/s. Calculate the percentage of these He atoms that have speeds greater than 5000 m/s
What is the length of the trapped air column in the short arm when the long arm is filled with mercury. Neglect the curvature of the closed end.
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd