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What is the charge on magnesium iodide? What does the charge on the magnesium ion have to do with the number of valence electrons that an atom of magnesium has?
On the basis of these data, (a) what will be the final temperature of the mixture and (b) how many grams of ice will melt?
A calorimeter contains 25.0 of water at 14.0. When 1.80 of (a substance with a molar mass of 82.0 ) is added, it dissolves via the reaction.
A gas sample containing 1.47 mol at 25°C exerts a pressure of 401 torr. Some gas is added to the same container, and the temperature is increased to 50.°C. If the pressure increases to 800.
A 20.0-mL sample of 0.400 M HBr solution is titrated with 0.400 M NaOH solution. Calculate the pH of the solution after the following volumes of base have been added.
An aqueous solution is prepared by diluting 3.30mL acetone, CH3COH3, (d= 0.789g/mL) with water to a final volumeof 75.0 mL. The density of the solution is 0.993 g/mL. what are the molarity and the m
Calculate the Ksp of lead iodide from the following standard electrode potentials, at 25 C oxidative -.126 redox -.365
What external pressures have moved mainstream medicine to accept alternative therapies? Have any alternative therapies been proven to work as well as standard treatments?
What is the pH of a phosphate buffer when [h2po4-1]=40mM and [hpo4-2]=3omM? assume the pKa for this titration is 7.2
How many joules of energy are necessary to heat the steam from 100.0 degrees Celcius to 114.0 degrees celcius if the specific heat of steam 2.01J/g degrees celcius.
How many grams of hydrogen are necessary to react comletely with 50.0 g of nitrogen in the following reaction: N2+3H2 = 2NH3?
The gas ammonia can be decomposed to give 3.00 parts by mass of hydrogen and 14.0 parts by mass of nitrogen. What mass of nitrogen is obtained if 1.27 g of ammonia is decomposed?\
A 6.0-g sample of [Ni(H2O)6]Cl2 is dissolved in aqueous solution. If an excess of ethylenediamine (en) is added to the solution, solid [Ni(en)3]Cl22H2O forms. What is the theoretical yield of product
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)