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Weak Bases

Q. Suppose that ammonia, applied to a field as fertilizer, is washed into a farm pond containing 5.0x10^6L of water. If the ph of this pond is found to be 8.35, What volume of liquid ammonia found its way into the pond? Kb(NH3)=1.8x10^-5 | The density of liquid ammonia is 0.771g/cm^3

Solved • Nov 19, 2019

Bond Energy

Q. Ethanol is a possible fuel. Use average bond energies to calculate ∆Hrxn for the combustion of ethanol: CH3CH2OH(g) + 3 O2(g) --> 2 CO2(g) + 3 H2O(g

Solved • Nov 19, 2019

Redox Reaction

Q. How is hydrogen produced? Group of answer choices By using electricity to separate water molecules into hydrogen and oxygen. Naturally, using certain types of algae. By extracting it from natural gas, coal, and other fossil fuels. All of the above.

Solved • Nov 19, 2019

Redox Reaction

Q. What are the two most common ways to produce hydrogen gas used in fuel cells? Group of answer choices Electromagnetism and quantum mechanics Electrolysis and absorption Steam reforming and electrolysis Thermal conductivity and refraction

Solved • Nov 19, 2019

Weak Acid Strong Base Titrations

Q. A 10.00mL sample of 0.500M HF is titrated with 0.250M of KOH. The Ka of HF is 7.2x10^-4. What is the pH before titration begins?

Solved • Nov 17, 2019

Calorimetry

Q. Mothballs are composed primarily of the hydrocarbon naphthalene (C10H8). When 1.025 g of naphthalene burns in a bomb calorimeter, the temperature rises from 24.25°C to 32.33°C. Find ∆E for the combustion of naphthalene. The heat capacity of the calorimeter, determined in a separate experiment, is 5.11 kJ/°C.

Solved • Nov 19, 2019

Calorimetry

Q. We submerge a 32.5-g iron rod, initially at 22.7 °C, into an unknown mass of water at 63.2°C, in an insulated container. The final temperature of the mixture upon reaching thermal equilibrium is 59.5 °C. What is the mass of the water?

Solved • Nov 19, 2019