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A compound of nitrogen and hydrogen was burned in air to produce nitrogen dioxide and water. The number of moles of nitrogen dioxide produced was 2.5 times the number of moles of water produced. Wha
A dog searching for a bone walks 3.50 m south, then 8.20 m at an angle of 30.0° north of east, and finally 15.0 m west. Use graphical techniques to find the direction of the dog's resultant disp
The density of chloroform, a widely used organic solvent, is 1.4832 at 20 . How many milliliters would you use if you wanted 119.0 of chloroform?
How much Au will be plated out (from a solution containing Au3+ ) by the same amount of current that plates 10.5 g of Cu (from a solution of Cu2+ )?
How fast (in rpm) must a centrifuge rotate if a particle 9.0 from the axis of rotation is to experience an acceleration of 125,000 g's?
Calculate the final temperature of 25.0 g of ethanol initially at 15C upon absorption of 565J of heat. (Density of ethanol = 0.789g/mL)
A 64 kg hiker climbs to the top of a 3600 m-high mountain. The climb is made in 5.0 h starting at an elevation of 2500 m. a) Calculate the work done by the hiker against gravity.
Several irregularly shaped pieces of zinc weighing 30.0g are droped into a graduated cylinder with an initial volume of 18mL. When the piece of zinc was dropped into the graduated cylinder, the wate
Calculate the theoretical yield of C2H3Cl when 120g of C2H6 reacts with 217g of Cl2, assuming that C2H6 and Cl2 react only to form C2H3Cl and HCl.
A speeding motorist traveling 135 km/h passes a stationary police officer. The officer immediately begins pursuit at a constant acceleration of 10.0 km/h/s (note the mixed units).
A He-Ne laser (mu=633nm) is used to heat up a sample. How many photons are needed to transfer 12 J of heat to the sample?
The water samples were the first to be analyzed. The analysis began by removing a number of aliquots. An aliquot is (a) a measure of the contamination of the lake water.
Consider a system consisting of 2.0 mol of carbon dioxide gas, initially at 25C and 10 atm and confined to a cylinder of cross section 10.0 cm2. It is allowed to expand adiabatically against an exte
A pain-relieving pill has a mass of 0.005 g rm g. Express the pill's mass in grams using scientific notation or in milligrams.
A graduated cylinder contains 25.0 of water. What is the new water level after 34.2 of silver metal with a density of 10.5 is submerged in the water?
he molar enthalpy of vaporization of NH3 is 23.3 kJ/mol at its normal boiling point of -33.3 .C. How much energy is required to evaporate 1.00 kg of ammonia at -33.3 .C?
What is the minimum length of a string whose fundamental frequency is 272 Hz? The speed of sound at this temperature is 340 m/s.
Calculate the enthalpy of vaporization of Br2. This element has vapor pressures of 271 mm Hg and 565 mm Hg at 30.0 .C and 50.0 .C, respectively.
Lakes that have been acidified by acid rain can be neutralized by liming, the addition of limestone (CaCO3 ). How much limestone in kilograms is required to completely neutralize a 3.8 x109 lake wi
A mass of 1.50 g H2O is sealed in an evacuated 3.0-L flask and heated to 55 .C. What mass of liquid water remains in the flask when equilibrium is established? The equilibrium vapor pressure of wate
A 5500 kg helicopter accelerates upward at 0.50 m/s^2 while liftinga 1200kg car. A. what is the lift orce exerted on the air by the rotors?
Compound TACN contains three elements: carbon, hydrogen, and nitrogen. Combustion of 0.258 g of TACN yields 0.528 g CO2 and 0.270 g H2O. Determine the empirical formula of TACN.
In a reaction between pure acetic acid and sodium bicarbonate, 32.1 grams of sodium bicarbonate was added to 6.00 mL of acetic acid. Which reactant is the limiting reactant in this reaction?
The tire is filled with dry air at sea level and a temperature of 60 F to 32 lb/aquare in.standard sea level pressure is 101325 Pa at 0 C (STP). How many moles of air are contained in the tire?hoy
Assume you have a 150 ml of 0.1 M HCl solution. You took 100 ml from it and added 400 ml of distilled water into it. What will be the pH of this new HCl soluion?