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Chemistry
Using Hess's law, calculate the delta H value for the following reaction:
FeO (s) + CO (g) → Fe (s) + 3CO₂
Use these three reactions:
1. Fe₂O₃ (s) + 3CO (g) → 2Fe (s) + 3CO₂ (g) ΔH = -25 kJ
2. 3Fe₂O₃ (s) + CO (g) → 2Fe₃O₄ (s) + CO₂ (g) ΔH = -47.0 kJ
3. Fe₃O₄ (s) + CO (g) → 3FeO (s) + CO₂ (g) ΔH = +38.0 kJ
FeO (s) + CO (g) → Fe (s) + 3CO₂
Use these three reactions:
1. Fe₂O₃ (s) + 3CO (g) → 2Fe (s) + 3CO₂ (g) ΔH = -25 kJ
2. 3Fe₂O₃ (s) + CO (g) → 2Fe₃O₄ (s) + CO₂ (g) ΔH = -47.0 kJ
3. Fe₃O₄ (s) + CO (g) → 3FeO (s) + CO₂ (g) ΔH = +38.0 kJ
Chemistry
Write thermochemical equations, two ways, for each of the following situations.
a) When 1 mole of NH4Cl is dissolved in water, 25.0 kJ is lost by the water
b) When acetic acid is neutralized by sodium hydroxide, 76 kJ (per mole of acetic acid) of heat is released
a) When 1 mole of NH4Cl is dissolved in water, 25.0 kJ is lost by the water
b) When acetic acid is neutralized by sodium hydroxide, 76 kJ (per mole of acetic acid) of heat is released
Chemistry
a 2.56 g sample of anthracene, C14H10, was burned to heat an aluminum calorimeter (mass=948 g). The calorimeter contained 1.50 L of water with an initial temperature of 20.5 degrees Celsius and a final temperature of 34.3 degrees Celsius.
a) Calculate the molar heat of combustion of anthracene
b) Write the thermochemical equation, two ways, for the complete combustion of anthracene
c) If the actual value of delta H = -7150 kJ/mol, what is the percentage error?
a) Calculate the molar heat of combustion of anthracene
b) Write the thermochemical equation, two ways, for the complete combustion of anthracene
c) If the actual value of delta H = -7150 kJ/mol, what is the percentage error?
Chemistry
What is the half-reaction for the reduction of oxygen that occurs with the corrosion of iron? Using this reaction, explain why corrosion occurs more slowly in dry climates
Chemistry
Describe the direction of ion and electron flow in a anode/cathode diagram (galvanic cell diagram)
Chemistry
you are given a powdered mixture of sulphur,potassium nitrate and carbon.state briefly how could you separate and collect each constituent in solid or powdered form?
Chemistry
When 2.40 moles of tricarbon octahydride are combusted, how many grams of water and carbon dioxide are formed?
Chemistry
Sam and Bob are conducting an investigation to determine the empirical formula of iron oxide. They start with an 85.65g piece of iron metal and burn it in air. The mass of the iron oxide produced is 118.37g. Sam thinks the empirical formula of iron oxide is Fe3O4 and Bob thinks it is FeO. Use what you know about how to determine the empirical formula of a compound.
Chemistry
Label the orbital with the following quantum numbers:
1)n=5 l=0
2)n=4 l=2
3)n=2 l=1
4)n=3 l=0
5)n=6 l=2
6)n=7 l=1
1)n=5 l=0
2)n=4 l=2
3)n=2 l=1
4)n=3 l=0
5)n=6 l=2
6)n=7 l=1
Chemistry
Using Rydberg's equation for the energy levels (E = -R/n^2) and the wavelength and the c=(lambda)v, E=hv equations, SHOW/ PROVE how E(red band in H-spectrum, lambda = 656 nm) = (Delta or change/ difference) E (3 --> 2)?
