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Suppose all the absorbed radiation is converted to heat. Calculate the number of photons at this wavelength required to raise the temperature of water by 5.00 degrees C.
The reactant concentration in a zero-order reaction was 7.00×10-2 after 180 and 3.00×10-2 after 340 . What was the initial reactant concentration for the reaction?
How many grams of precipitate are formed when 217 mL of a 0.741 M aluminum sulfate soultion and 338 mL of a 1.51 M sodium hydroxide solution are mixed together?
A volume of 80.0 mL of rm H_2O is initially at room temperature (22.0rm{}~^{circ}C). A chilled steel rod at 2.00rm~^{circ}C is placed in the water. If the final temperature of the system is 21.4~^{c
Calculate the freezing point and boiling point of a solution of 383 g of glucose dissolved in 400. g of water.
After the reaction has gone to completion, the pressure inside the flask is 390. torr at 20.°C. What is the mass percent of MgO in the mixture? Assume that only the MgO reacts with CO2.
A weather balloon with a 2-meter diameter at ambient temperature holds 525 grams of helium. What type of electronic probe could be used to determine the pressure inside the balloon?
A gas sample containing 1.45 mol at 25°C exerts a pressure of 397 torr. Some gas is added to the same container, and the temperature is increased to 50.°C. If the pressure increases to 800.
Determine the boiling point of a solution of 72.4 g of glycerol dissolved in 122.5 g of water.
Calculate the final temperature of the mixture assuming no heat loss to the surroundings. The heat capacities of H2O(s) and H2O(l) are 2.08 and 4.18 J/g · °C, respectively, and the enthal
On the basis of this information, which of the following crystal structures is (are) possible for this material: sodium chloride, cesium chloride, or zinc blende?
The mass of a proton is 1.673 ⋅ 10-24 g. The mass of a neutron is 1.675 ⋅ 10-24 g. The mass of the nucleus of an 56Fe atom is 9.289 ⋅ 10-23 g. What is the nuclear binding energy (in J)
What is the boiling point of a solution of 30.20 g of ethylene glycol, HOCH2CH2OH, in 88.40 g of phenol?
The rate constant for a certain reaction is k = 3.50×10-3 s^{-1}. If the initial reactant concentration was 0.900 M, what will the concentration be after 2.00 minutes?
What mass of ethanol, CH3CH2OH, should be dissolved in 450. g of water to obtain a freezing point of 4.5°C?
Geologists can estimate the age of rocks by their uranium-238 content. The uranium is incorporated in the rock as it hardens and then decays with first-order kinetics and a half-life of 4.5 billion
Calculate the molar mass of a nonelectrolyte that lowers the freezing point of 25.00 g of water to 3.9°C when 4.27 g of the substance is dissolved in the water.
Again, are all of the (non-zero) formal charges consistent with the relative EN's of the atoms? Are the structures reasonable?
In one experiment, 30.5g of dry ice are placed in an insulated, isolated container with 500g of water at 25.0°C. What temperature of the water is expected after all bubbles are gone? (The specif
What is the freezing point of a solution of 1.17 g of 1-naphthol, C10H8O, dissolved in 2.00 mL of benzene at 20°C? The density of benzene at 20°C is 0.876 g/mL. Kf for benzene is 5.12°C/
How do you calculate a cube of an unknown metal measures 1.61mm on one side. the mass of the cube is 36mg. which of the following is most likely the unknown metal rhodium.
What do you do when you are calculating the empirical and molecular formulas of a compound and the percent composition by mass totals greater than 100%?
The boiling point of a solution containing 10.44 g of an unknown nonelectrolyte in 50.00 g of acetic acid is 159.2°C. What is the molar mass of the solute?
A natural product (MW=150) distills with steam at a boiling temperature of 99 degrees Celsius at atmospheric pressure. The vapor pressure of water at 99 degrees Celsius is 733 mm Hg.
What are some possible sources of error that might lead to an erroneous determination of the concentration of the acetic acid.