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A 21.15 g piece of iron and a 25.05 g piece of gold at 100.0 degreesC were dropped into a 720.0 mL of water at 18.45 degreesC. The molar heat capacities of iron and gold are 25.19 J/(mol degreesC) a
What is the percent yield if only 153 g of XeF4 is actually isolated?
Methane burns to the following reaction; CH4(g)+ 202(g)= 2H20(1)+ CO2(g) H=-890.4 kilojoules. Calculate the number of kilojoules obtained from the complete combustion of 100.0 g of methane.
Using calipers, you find that a copper cylinder has length 8.625 cm and diameter 1.218cm . An electronic pan balance shows that its mass is 89.84 g. Find the cylinder's density.
At constant volume, the heat of combustion of a particular compound is -3973.0 kJ/mol. When 1.481 g of this compound (molar mass = 172.71 g/mol) was burned in a bomb calorimeter, the temperature of
A 3.00-rm L flask is filled with gaseous ammonia, rm NH_3. The gas pressure measured at 22.0, ^{circ}C is 2.05 atm. Assuming ideal gas behavior, how many grams of ammonia are in the flask?
A dolphin in 25°C sea water emits a sound directly toward the bottom of the ocean 135 m below. How much time passes before it hears an echo? (The speed of sound in sea water is 1530 m/s.)
Chlorine, Cl2, is produced commercially by the electrolysis of aqueous sodium chloride. How long will it take to produce 1.25 kg of chlorine if the current is 5.00 102 A?
What is the molar mass of a compound that takes 1.45 times as long to effuse through a porous plug as it did for the same amount of XeF2 at the same temperature and pressure? Answer in units of g/mo
Write the acid/base equilibrium reaction (net-ionic) for the major species present in an aqueous solution of each of the following substances. use H3O+ as the acidic species
How many times faster is the speed you found in (a) than the speeds of our fastest current spacecraft (around 50,000 km/hr)?
Calculate the density, mole fraction, molarity, and molality of the solution. Assume water has a density of 1.00 g/cm3.
One cubic meter (1.0 m3) of aluminum has a mass of 2700 kg, and a cubic meter of iron has a mass of 7860 kg. Find the radius of a solid aluminum sphere that has the same mass as a solid iron sphere
Arrange CH4, Cl2, and CO2 in order of increasing strength of dispersion forces. (least to the greatest)
Calculate the equilibrium concentrations of reactants and product when 0.238 moles of CH4 and 0.238 moles of CCl4 are introduced into a 1.00 L vessel at 350 K.
If 1.87 g of acetic acid(CH3CO2H) reacts with 2.31g of isopentyl alcohol(C5H12O) to give 2.96 of isopentyl acetate(C7H14O2), what is the percent yield of the reaction?
The dipole moment () of HBr (a polar covalent molecule) is 0.784 (debye), and its percent ionic character is 11.6 . Estimate the bond length of the bond in picometers.
The velocity of the pile driver at the point of contact with the pile.
Why cost is often a major factor in choosing a limiting reactant?
A baseball pitcher throws a fastball horizontally at a speed of 155km/h toward home pplate, 17.2m away. ignore air resistance. a)if the batter's combined reaction and swing times total 0.350s, how l
An experiment shows that a 248 gas sample has a mass of 0.433 g at a pressure of 745 mm Hg and a temperature of 28 C. What is the molar mass of the gas?
Calculate at 25°C for this battery when [H2SO4] = 4.5 M, that is, [H+] = [HSO4-] = 4.5 M. At 25°C, ° = 2.04 V for the lead storage battery.
A ball on a porch rolls 60 cm to the porch's edge, drops 40 cm, continues rolling on the grass, and eventually stops 80 cm from the porch's edge. What is the magnitude of the ball's total displaceme
If the reaction rate doubles when the temperature is increased to 35 degrees C, what is the activation energy for this reaction in kJ/mol?
While visiting england you decide to take a jog. What is your displacement, average velocity, and average speed after running 2.0 km on strawberry fields and 1.0 km on penny lane?