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If 100 grams of potassium (K) reacts with 260 grams of iodine (I2) to form potassium iodide (KI), which is the limiting reactant? If the percent yield is 80% how much KI is produced?
A student analyzes a sample and finds out it contains 25% of NaCl. After that he realises the sample contained KCl instead of NaCl. What is the % concentration of KCl in the sample?
is there two chemical liquids that make an endothermic reaction?
Hye,can I know what are the the difference between sitosterol and beta sitosterol?
What kind of overall charge does an atom have if there is the same numbers of protons and electrons? Explain
How many years would it take for the geothermal system to pay for itself? Assume
that you are looking to install a new system, and that you can obtain a government
grant to do so. Use the costs that were mentioned on the previous page. Show all of
your calculations.
Installation Costs
• geothermal system: $20 000
• conventional system: $3500
• government grant for geothermal installation: $7000
Operating Costs
• geothermal: $100/month
• conventional: $150/month, plus $400/yr for air conditioning
however on previous page it stated: operate the hot-water tank is around $150 per month. Operating the heat pump would cost about $100 per month, but, without having to pay for air conditioner would save $400 per year.
that you are looking to install a new system, and that you can obtain a government
grant to do so. Use the costs that were mentioned on the previous page. Show all of
your calculations.
Installation Costs
• geothermal system: $20 000
• conventional system: $3500
• government grant for geothermal installation: $7000
Operating Costs
• geothermal: $100/month
• conventional: $150/month, plus $400/yr for air conditioning
however on previous page it stated: operate the hot-water tank is around $150 per month. Operating the heat pump would cost about $100 per month, but, without having to pay for air conditioner would save $400 per year.
Sodium bicarbonate (NaHCO3) is often used in the kitchen to extinguish fires. When heated, it decomposes into sodium carbonate, water vapour and carbon dioxide. The delta H for the reaction of 1 mole of sodium bicarbonate is +64.6KJ.
a) Write a balanced thermochemical equation for this reaction.
b) Using the enthalpies of formation, calculate the enthalpy of formation of sodium bicarbonate
a) Write a balanced thermochemical equation for this reaction.
b) Using the enthalpies of formation, calculate the enthalpy of formation of sodium bicarbonate
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
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
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?
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#339914 on Dec 2023
#339914 on Dec 2023