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Many cigarette lighters contain liquid butane)Using enthalpies of formation, calculate the quantity of heat produced when 3.80 g of butane is completely combusted in air under standard conditions.
Two 2.00L flasks, one of which contains 0.250 mole O2 gas at 50.0 deg C. In which flask is the ratio of molecular volume to sample volume greater?
There is a region of magnetic field. from a centre point from it there are 2 semi infinite wire making some angle the region is having rdius r. what will be the magnetic field intensity at that cent
A 0.041 M solution of a monoprotic acid is 12 percent ionized. Calculate the ionization constant of the acid.
Rubidium-87 decays by beta decay with a half-life of 4.9 x 10^10 yr. How many 87Rb atoms are in a moon rock sample that has a rubidium decay rate of 3500 disintegrations per hour.
An aqueous solution contains 4.90% NH3 (ammonia) by mass. The density of the aqueous ammonia is 0.979 g/mL. What is the molarity of NH3 in the solution?
A 0.264-gram sample of an amino acid was dissolved in 95.0mL of water and titrated with 0.105M NaOH. The first equivalence point was found at V(OH)=16.3mL. What is the molar mass of the amino acid t
A rifle is aimed horizontally at a target 51.0m away. The bullet hits the target 2.50cm below the aim point. a) What was the bullets flight time? b) What was the bullets speed as it left the barrel?
Consider the following reaction: K2S(aq)+ Co(NO3)2(aq) - 2 KNO3(aq) + CoS(aq) What volume of 0.225 M K2S solution is required to completely react with 175 mL of 0.115 M Co(NO3)2?
A 1.43-L flask is filled with propane gas (C3H8), at 1.00 atm and -23.0°C. What is the mass of the propane in the flask?
A 350 N child is in a swing attached to ropes 1.75m. Find the gravitational PE associated with the child relative to her lowest position when the ropes make a 30 degree angle with the vertical.
Two packing crates of masses m1 = 10.0 kg and m2 = 4.50 kg are connected by a light string that passes over a frictionless pulley as in the figure below. The 4.50 kg crate lies on a smooth incline o
Calculate the total entropy change for the contents of the bath (ice, water, and nickel). NOTE: enthalpy of fusion of ice = 334. J g-1. Specific heats at constant pressure: nickel, 0.46 J K-1 g-1.
However, after the crate is in motion, a horizontal force of 59 N is required to keep it moving with a constant speed. Find the coefficients of static and kinetic friction between crate and floor.
A solution was made by taking 1.250g of KMnO4 and dissolving it in enough water to make 1.000 liter of solution. How many mL of this solution are required to titrate a 0.480 g sample of H2C2O4·
The Base composition for one of the strands of the DNA double helix is 25%A, 35%C, 18%G, and 22%T. What is the percent base composition for the other strand of the DNA double helix?
A space station, in the form of a wheel 127 m in diameter, rotates to provide an "artificial gravity" of 4.00 m/s2 for persons who walk around on the inner wall of the outer rim. Find the rate of th
A 9000 kg railroad car is moving at 3m/s strikes a stationary (not moving) 5000 kg railroad car. if the two rail road cars couple and move off together after the collision, what is their velocity?
Calculate the percentage of empty space in 1 mol of water at 25C. Obtain the density from the experiment " Some Measurements of Mass and Volume."
A stone is thrown with an initial speed of 10.6 m/s at an angle of 52 degrees above the horizontal from the top of a 30 m building. If air resistance is negligible, then what is the magnitude of the
What is the equilibrium partial pressure (in atm) of H2S if a solid sample of NH4HS is placed in a closed container and allowed to reach equilibrium at 295 K.
In addition, the snow exerts a retarding force on the sled that points opposite to the direction of motion, and has a magnitude of 57. Find the acceleration of the sled and child.
The male figure is 180 cm tall, the female 168 cm. Normalize the displacements of each figure to a common height of 200 cm, and re-form the vector sums as in part (a). Then find the vector differen
How many liters of ammonia gas can be formed from the reaction of 150 L of hydrogen gas? Assume that there is complete reaction of hydrogen gas with nitrogen gas.
A 214-kg log is pulled up a ramp by means of a rope that is parallel to the surface of the ramp. The ramp is inclined at 31.0° with respect to the horizontal. The coefficient of kinetic frictio