Start Discovering Solved Questions and Your Course Assignments
TextBooks Included
Active Tutors
Asked Questions
Answered Questions
The freezing point depression constant for water is -1.86 ?C/m. If 5.00 g Na2SO4 is dissolved in 45.0 g H2O,the freezing point is changed by -3.82 ?C. Calculate the van't Hofffactor for Na2SO4
Calculate the pH after 0.120 g ofsolid NaOH is added to 150 mL of this buffer solution.c. If the acceptable buffer range of the buffer solution is ±0.10 pH units, calculate how many moles
What volume will a sample of hydrogen occupy at 270.2 K ifthe gas occupies a volume of 2.23 liters at a temperature of 0.0oC? Assume that the pressure remains constant.
Heavy metal azides, which are salts of hydrazoic acid,HN3, are used as explosive detonators. A solution of0.10 M hydrazoic acid has a pH of3.36. What is the Kafor hydrazoic acid?
A neon atom emits light at many wavelengths, two of which areat 616.4 and 638.3 nm. Both of these transitions are to thesame final state.
A particularrefrigerator cools by evaporating liquefied chlorodifluoromethane,CCL2F2. How many kilograms of this liquidmust be evaporated to freeze a tray of water at 0' C toice at 0' C?
Wonder woman stopped a villain's bullet with her goldmetal wristband. The bullet was traveling with a kineticenergy of 52.6 joule when it hit the wrist band.
48.69 g of zinc metal is heated in a dry test tube in aboiling water bath to 99.95 °C. The hot zinc metal is then dropped into 98.55 g of water at 20.65 °C in acalorimeter.
Cholesterol is an important constituent of eukaryotic cell membranes and affects the fluidity of the membrane. Consider the structure of cholesterol and suggest how it might be orientated in the mem
Why is a large steriod molcule such as oestrone able to cross the cell membrane when a smaller molecule such as adrenaline can not?
If 7.48 g of a particular gas occupies 250mL at a temp of 28.4 degrees C and a pressure of 623 torr, then the elemental composition of this gas is 30.45%N and 69.55% O by mass.
What is the heat capacity of a bomb calorimeter if 0.03550g of benzoic acid (26.38kJ/g) raisesthe temperature of the caliorimeter from 25.13C to 33.30C?
Determine the freezing point of a solution that contains 30.7g of glycerin ( C3H8O3) molar mass is 92.09 g/mol in 36ml of water Kf is 1.86 degree C and Kb is 0.512 degree C/m
Consider a Li+2 ion, stimulated to an excited energy level by conditions in an electric discharge. If the ion is initially in the n=13 level and relaxes to the n=5 level, what is the wave lengt
The rate of a particular reaction quadruples when the temperature is increased from 298K to 308K. Calculate the activation energy for this reaction.
What color is the solution initially? The solution is titrated with 0.10 M NaOH. At what pHwill the color change (yellowish to greenish yellow) occur?
102.0 mL of a solution of quinine contains 132.6×10-3 molof quinine. If this is titrated with 0.200 M HCl, what is the pH half-way to the stoichiometric point?
To make a solution with a pH = 3.90 a student used the following procedure : a certain amount of sodium acetate along with 0.260 moles of aceticacid is added to enough water to make a solution of
The half-life of iodine 131is 8.021 days. If a person has a 1.000g of iodine131today, in how many days the remaining amount of the iodine131 will be 0.006250g?
Calculate the average rate of decomposition reaction if theconcentration of NOCl2 is 0.0364 M at t = 0.245 minutes and 0.0107M at t = 3.432 minutes. Express the answer in M/s. [Hint: convertthe time
An acid with a pKa of 8.0 is present in a solution with a pH of 6.0. What is the ratio of the protonated to the deprotonated form of the acid?
To make a solution with a pH of 4.50 a student used the following procedure:A certain amount of sodium acetate along with 0.300 moles of acetic acid is added to enough water to make a solution of1.0
Calculate the mass of HONH2 required to dissolve in enough water to make 250 ml of solution having a pH of 10.00 (Kb= 1.1 x 10^-8)
A quantity of ore consist of 90% (by weight) chalcopyrite mineral with a composition of CuFeS2. The rest is inert quartz,SiO2. The ore is roasted by heating it in oxygen at800oC.
Calculate the pressure of 11.4 g of sulfur dioxide in a 24.0 mL vessel at 25.0 degrees Celsius using a) the ideal gas law and b) the van der Waals equation using Waals' constants ( a = 6.714; b = 0