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An aqueous solution contains 10% ammonium by mass and has a density 0.99 gcm-3 . Calculate hydroxyl and hydrogen ion concentration in this solution. if Ka for ammonium ion = 5.0 x 10^-10.
What is the elastic potential energy of the system when the 2.0-kg block is replaced by a 4.1-kg block?
A 67.0 kg base runner begins his slide into second base when moving at a speed of 3.7 m/s. The coefficient of friction between his clothes and Earth is 0.70. He slides so that his speed is zero just
A 47.0- person takes a nap in a backyard hammock. Both ropes supporting the hammock are at an angle of 16.0 above the horizontal. Find the tension in the ropes.
A carbon resistor is to be used as a thermometer. On a winter day when the temperature is 4.00, the resistance of the carbon resistor is 217.4 . What is the temperature on a spring day when the resi
What was the final temperature of the gold if the initial temperature was 22.0°C? The specific heat of gold is 0.129 J/(g·°C).
15.0 moles of gas are in a 8.00L tank at 24.6°C . Calculate the difference in pressure between methane and an ideal gas under these conditions. The van der Waals constants for methane are a=2.300L2
A superhero flies 156 m from the top of a tall building at an angle of 35 ? below the horizontal. What is the vertical component of the super-hero's displacement?
How many moles of sodium phosphate are required to react completely with 4.6 mol of calcium nitrate to form sodium nitrate and calcium phosphate?
Suppose a 64-kg boy and a 48-kg girl use a massless rope in a tug-of-war on an icy, resistance-free surface. If the acceleration of the girl toward the boy is 3.0 m/s2, find the magnitude of the ac
A baseball is thrown at an angle of 28 degrees relative to the ground at a speed of 25.6m/s. The ball is caught 55.3841m from the thrower. The acceleration due to gravity is 9.81m/s square. How lon
In a coffee-cup calorimeter, 1.70 g of NH4NO3 is mixed with 79.0 g of water at an initial temperature of 25.00°C. After dissolution of the salt, the final temperature of the calorimeter contents
Dilute solutions of NaCl, Na2SO4, and Na2S are available to separate the positive ions from each other. In order to effect separation, the solutions should be added in which order?
An electric dipole p makes an angle of 30° with a uniform electric field of magnitude 300 N/C. If the torque on the dipole is 3.00 × 10-12 N · m then calculate the magnitude of the
A sample of a gas in a cylindrical chamber with a movable piston occupied a volume of 4.626 liters when the pressure was 0.983 atm and the temperature was 27.2 °C. The pressure was readjusted to
A rock of mass 47 kg accidentally breaks loose from the edge of a cliff and falls straight down. The magnitude of the air resistance that opposes its downward motion is 252 N. What is the magnitude
A 160.0 g ball on a 70.7 cm long string is swung in a vertical circle about a point 184.0 cm above the floor. The string suddenly breaks when it is parallel to the ground and the ball is moving upw
If 80.0 g of ethylene and 125 g of HCl are allowed to react at atmospheric pressure and the volume change is -63.9 L? What is the value of (in kilojoules) for the reaction?
What volume of 3.00M HCl in liters is needed to react completely (with nothing left over) with 0.500L of 0.200M Na2CO3?
A projectile, fired with unknown initial velocity, lands 18.8 s later on the side of a hill, 3140 m away horizontally and 433 m vertically above its starting point. What is the vertical component o
A 35.6g sample of ethanol is burned a bomb calorimeter, according to the following reaction. If the temperature rose from 35.0 to 76.0c and the heat capacity of the calorimeter is 23.3kj/c what is
Sam, whose mass is 60 kg, takes off across level snow on his jet-powered skis. The skis have a thrust of 280 N and a coefficient of kinetic friction on snow of 0.15. Unfortunately, the skis run out
A nurse applies a force of 4.40 N to the piston of a syringe. The piston has a radius of 4.00 mm. What is the pressure increase in the fluid within the syringe?
A 757 mL gas sample at STP is compressed toa volume of 118 mL, and the temperature isincreased to 39 degrees C. What is the new pressureof the gas in Pa?
A man pushes horizontally on a desk that rests on a rough wooden floor. The coefficient of static friction between the desk and floor is 0.750 and the coefficient of kinetic friction is 0.600. The