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When the calorimeter and its contents are weighed, 1.2 g of water are found to have evaporated. What was the temperature tC?( in degrees celcius)
For NH4Br dissolving in water, ΔHsoln is17kJ/mol. Write an equation that represents the solubility equilibrium for NH4Br dissolving in water. Include heat in the equation.
A 3.4 kg mass attached to a spring is displaced 6.2 cm from the equilibrium position. It is released and then oscillates with a frequence of 3.1 Hz. a) What is the energy of the motion when the mass
The normal boiling point of ethanol(C2H5OH) is 78.5'C. Using the information from Thermodynamic Data at 1 atm and 25'C, and the following information:
A mass, m1 = 7.98kg is at rest on a frictionless horizontal surface and connected to a wall by a spring with k= 64.6 N/m. A second mass, m2 =4.94kg, is moving to the right at v0= 26.2 m/s. The two
Polonium metal crystallizes in a lattice which contains onlyone Po atom per cubic unit cell. The radius of a polonium atom is1.67 Å.
The press box at a baseball park is 36.0 ft above the ground. A reporter in the press box looks at an angle of 13.1° below the horizontal to see second base. What is the horizontal distance fro
An 80 kg construction worker sits down 2.0 m from the end of a 1450 kg steel beam to eat his lunch. The cable supporting the beam is rated at 15,000 N. Should the worker be worried?
Aluminum hydroxide reacts with sulfuric acid. Which reagent is the limiting reactant when 0.700 mol of aluminumhydroxide and 0.700 mol sulfuric acid are allowed toreact?
An astronomical unit (AU) is the average distance of Earth from the Sun, approximately 1.50 × 108 km. The speed of light is about 3.0 × 108 m/s. Express the speed of light in terms of astr
What does it mean by Carbocation of a molecule is expected to rearrange or not expected to rearrange ? Would you show me with some diagrams ?
A severe thunderstorm dumped 2.8 in of rain in 30 min on a town of area 34 km2. What mass of water (in kg) fell on the town? One cubic meter of water has a mass of 103 kg.
Based on the synthesis chart provided in the Organic course notes,what is the smallest number of synthetic steps needed to convert aketone to an alkane?
Two identical conducting spheres, fixed in place, attract each other with an electrostatic force of 0.108 N when separated by 0.500 m. The spheres are then connected by a thin conducting wire. When
The first submarine travels at an average velocity of 20 km/hr for the first 500 km, 40 km/hr for the next 500 km, 30 km/hr for the next 500 km and 50 km/hr for the final 500 km. In the plot, the se
If salt is used on icy roads in the winter to lower the freezing point of water to assist inmelting, in theory, what substance can be used to increase the boiling point of that same water?
1 cubic Meter, (1.00m^3) of aluminum has a mass of 2.70x10^3 kg, and a 1.00m^3 of iron has a mass of 7.86x10^3 kg. Find the radius of a solid aluminum sphere that will balance a solid iron sphere of
Calculate the concentration of CN- and the pH for asolution that is made by mixing 50mL of 0.1 M HClO4 with4.2 mL of 0.438 M NaCN. Assume HClO4 to be a strongacid, NaCN to be a strong electrolyte (d
Suppose that you wish to fabricate a uniform wire out of 0.800 g of copper. Assume the wire has a resistance R = 0.300 , and all of the copper is used. (a) What will be the length of the wire?
Calculate the final temperature if the same gas under goes an adiabatic expansion against an external pressure of P = 1.00 bar to a final pressure of P =1.00 bar.
A person stands at the base of a hill that is a straigt incline making an angle omega with the horizontal. For a given initial speed, at what angle theta(from the horizontal) should objects be throw
(a) At what time is the water mass greatest, and (b) what is that greatest mass? In kilograms per minute, what is the rate of mass change at (c) t = 2.1 s and (d) t = 4.7 s?
The mass of the rod is M and the magnitude of the impulse applied by the blow is J. (Use any variable or symbol stated above as necessary.) (a) Immediately after the rod is struck, what is the veloc
What happens to therate if the concentration of potassium t-butoxide is tripled and the concentration of ethyl bromide is doubled?
If, instead, the gold is drawn out into a cylindrical fiber of radius 2.400 µm, what is the length (in m) of the fiber?