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The mass of the Li sample is 1.40 g. After 10 min of heating Li was converted to lithium oxide and mass of the sample became 3.00 g. Calculate the mole ratio of O and Li in the lithium oxide
A 457- sample of unknown HCL solution reacts completely with to form 16.1g CO2 . What was the concentration of the HCL solution?
The piece of iron with a mass 102.9g was submerged in a graduated cylinder filled with water. The initial level of water was 20.0 ml. The density of iron is 7.86 g/ml. What was the level of water i
A hunter wishes to cross a river that is 1.0 km wide and flows with a speed of 5.0 km/h parallel to its banks. The hunter uses a small powerboat that moves at a maximum speed of 10 km/h with respect
Calculate the concentrations of H3O? and the pH of each acidic solution. Since HCl is a monoprotic acid, the H3O? concentration is equivalent to the HCl molarity.
The force exerted by the wind on the sails of a sailboat is 310 N north. The water exerts a force of 210 N east. If the boat (including its crew) has a mass of 350 kg, what are the magnitude and dir
What is the entropy change for a particle in this system if the final number of microstates is 0.617 times that of the initial number of microstates?
Iron can be prepared by the reaction of Fe2O3 with carbon according to the equation: If 401 g Fe2O3 and 205 g C are heated together, how many grams of iron could be produced?
The radius of the cylinder is 3.80 m and the coefficent of static friction between the rider and the wall is 0.480. Find the tangential velocity of the spinning wall necessary so that the riders do
A gas has a pressure if .37 atm at 50 C. what is the pressure at standard temperature?
When 228.4 mg of pure X was burned 627.4 mg of CO2 and 171.2 mg of H2O were obtained. Determine the simplest formula of the compound X.
26.0cm of a solution containinh 1.86g of X2CO3 in 250 reacted completely with 27.0cm of solution contain 3.65g of HCL per dm,calculate the molar mass of X2CO3 and relative atomic mass of X, and ide
The magnitude of the maximum acceleration is typically 1.3 , but the driver will usually maintain a constant acceleration that is less than the maximum. A train travels through a congested part of t
You have isolated a strain of E. coli that is resistant to penicillin, streptomycin, chloramphenicol, and tetracycline. You also observe that when you mix this strain with cells of E. coli.
50.0 mL of 1.0 M HCl at 25.0oC were mixed with 50.0 mL of 1.0 M NaOH also at 25.0oC in a styrofoam cup calorimeter. After the mixing process, the thermometer reading was at 31.9oC. Calculate the ene
A 28.5 g sample of an unknown metal is heated to 95.0C and then dropped into 58.0 g of water in a coffee-cup calorimeter. The temperature of the water rises from 23.5 C to 27.1C. Calculate the speci
A certain elevator cab in a New York hotel has a total run of 185 m. Its maximum speed is 272 m/min. Its acceleration (both speeding up and slowing down) has a magnitude of 1.32 m/s2. How long does
A cannon ball made of iron has a volume of 100 . If iron has a density of 7.86 , what is the mass, in kilograms, of the cannon ball?
If the reaction between iron(III) ion and thiocyanate ion yielded an equilibrium concentration of 0.30 M for each of these ions, what is the equilibrium concentration of the red iron(III)-thiocyana
What is an example of a balance reaction beryllium is involved in for a common substance?
If the presure of 50.0 mL of oxygen gas at 100oC increases from 735 mm Hg to 925 mm Hg, what is the final volume? Assume the temperature remains constant.
The distance from the center of the bar magnet to the center of the compass is 22 cm. A steady current of 0.937 amperes runs through the coil. Conventional current runs clockwise in the coil when vi
How many milliliters (mL) of a 1.28 M sulfuric acid solution are needed to neutralize 60.2 mL of a 0.427M sodium hydroxide solution?
Tetrachloroethylene, C2Cl4, can be prepared by reacting acetylene (C2H2), chlorine and calcium hydroxide. The equation for the reaction is:
The most common source of copper is the mineral chalcopyrite . How many kilograms of chalcopyrite must be mined to obtain 385 of pure ?