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Draw a rough sketch of the energy profile for each of the following cases. a. E = +10 kJ/mol, Ea = 25 kJ/mol b. E = -10 kJ/mol, Ea = 50 kJ/mol c.
How much heat is required to warm 211 g of ice from -45.9°C to 0.0°C, melt the ice, warm the water from 0.0°C to 100.0°C, boil the water, and heat the steam to 173.0°C?
What mass of iron is needed in order to supply the energy needed to warm 15.0mL of water (d= 1.00 g/cm3) from 23C to 37C
Lidocaine is thought to bind to receptors in its methylated form. identify in writting the atoms or groups in the compound that could be involved in its binding to a receptor via- hydrogen bonding (1 example)
barium metal crystallizes in a body-centered cubic lattic. The unit cell edge length is 502 pm, and the density of the metal is 3.50 g/cm3. Using this information.
A calorimetry experiment determined that the combustion of 1.01 g of H2 reacting with excess O2 producing H2O gave q=143 kJ. Calculate the change in enthaply.
Suppose a black-body chamber is constructed from 55.8 g (one mole) of iron and heated to 500 K. Classical theory and the observations of Dulong and Petit indicate that the total energy of vibration of iron atoms is 3RT per mole.
4 KO2 + 2 H2O + 4 CO2 ==> 4 KHCO3 + 3 O2 How many moles of O2 will be produced if 5.17 moles of CO2 react completely?
The concentration of oxygen, O2, dissolved in a sample of seawater is 6.22 ppm by mass (concentration 1 ppm - 1 part per million - means
Calculate the molar mass of a gas that has a density of 0.232 g/L at 156 oC and 222 torr. Use R = 0.0821 L-atm/mol-K for the value of the gas constant.
the rate at which a substance through a semipermeable membrance is determined by the diffusivity D(cm^2/s)of the gas . D varies the membrance temperature
A 5.0 ml sample of vinegar was titrated with 7.2 ml of 0.55 M NaOH. if the density of vinegar solution is 1.00g/ml, what is the mass percent of acetic acid present.
what is the average power (energy per unit time) in units of watts (1W = 1J/s) associated with such a pulse? b. How many photons are emitted in such a pulse?
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