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Assuming the solution has a heat capacity of 4.18 J/°C · g and assuming no heat loss to the calorimeter, calculate the enthalpy change for the dissolution of NH4NO3 in units of kJ/mol.
500.0 gram sample of aluminum is initially at 25.0 °C. It absorbs 32.60 kJ of heat from its surroundings. What is its final temperature, in °C?
A sample of 0.6760 g of an unknown compound containing barium ions (Ba2+) is dissolved in water and treated in excess Na2SO4. If the mass of BaSO4 precipitate that forms is 0.4105 g. What is the per
The battery has internal resistance of 0.100 Ω, and the rod and rails have negligible resistance. A 2.02 T magnetic field is directed perpendicular to the plane of the circuit. (a) Find the ma
How many hydrogen sulfide molecules would be required to reach the lethal dose in a room that is 77 feet long, 62 feet wide and 50. feet tall at 1.0 atm and 25.0 oC?
A flywheel with a very low friction bearing takes 1.9 h to stop after the motor power is turned off. The flywheel was originally rotating at 34 rpm. What was the initial rotation rate in radians per
A tennis player receives a volley with the ball (0.0600 kg) traveling horizontally at 51.0 m/s and returns the ball so that it travels horizontally at 42.0 m/s in the opposite direction. What is th
The equivalence point is reached when 28.38 of solution is added. What is the concentration of the unknown solution?
When they are relaeased from rest will they start to move? If so determine their acceleraton and the tension in the string. If not determine the sum of the magnitudes of the forces of friction actin
A hot iron horseshoe (mass=0.40 kg), just forged is dropped into 1.35 L of water in a 0.30-kg iron pot initially at 20 degree celsius. If the final equilibrium temperature is 25.0 degree cesius, es
If 122mL mL of a 1.0M M glucose solution is diluted to 550.0mL mL , what is the molarity of the diluted solution?
If 0.00586mol N2O(g) effuses through an orifice in a certain period of time, how much NO2(g) would effuse in the same time under the same conditions?
The surface area of 100 g of glucose is much larger than that of 1 g. In no more than 100 words, explain why the solubility does not increase with the amount of solid deposited at the bottom of the
A 73.0 kg man stands on a spring scale in an elevator. Starting from rest, the elevator ascends, attaining its maximum speed of 1.90 m/s in 1.50 s. It travels with this constant speed for the next 5
A 22 diameter bowling ball has a terminal speed of 77 m/s}. What is the ball's mass?
Calculate the horizontal force that must be applied to produce and acceleration of 1g for 1kg puck on a horizontal friction air table.
A bungee jumper undergoes simple harmonic motion with amplitude 4.8m and frequency .105Hz. Assume the bungee jumper follows the simple harmonic motion equation x=Acos(wt) determine the bungee jumpe
When a concentrated NaOH solution is added drop wise, Mg(OH)2 begins to precipitate first. What is the concentration of Mg2+ ions when Ca(OH)2 just begins to precipitate?
It took Abigail 62.5 cal of heat to raise the temperature of 28.8 grams of a substance from 20.0 C to 22.8 C. What is the specific heat of the substance she used?
A mass m1 = 13.5 kg and a mass m2 = 11.0 kg are suspended by a pulley that has a radius of 9.8 cm and a mass of 3.2 kg (see figure). The cord has a negligible mass and causes the pulley to rotate wi
Consider the solubility of Cu(OH)2. Determine the solubility of Cu(OH)2 in 1.0 M NaOH (aq). The Ksp is 4.8 x 10-20.
Calculate the time t for the pencil to hit the ground, assuming that it falls from standing perfectly vertical and maintains this angular acceleration.
13.0 moles of gas are in a 4.00L tank at 20.1°C . Calculate the difference in pressure between methane and an ideal gas under these conditions.
The person and canoe have a combined mass of 100 kg. Ignore air resistance and effects of the water and find the horizontal recoil velocity (magnitude and direction) of the person and canoe.
A 79 kg pole-vaulter falls from rest from a height of 7.2 m onto a foam-rubber pad. The pole-vaulter comes to rest 0.48 s after landing on the pad. Calculate the athlete's velocity just before reach