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The KHP you used had not been dried. b) When filling the buret with NaOH you left a air bubble in the buret tip.The bubble was released during your first KHP titration.
An electric heater consumes electrical energy at a rate of P = 200 W when connected to a battery with an emf of 120 V. What is the current in the heater
If the standard enthalpy of combustion of octane, C8H18(l), at 298 K is -5471 kJ x mol-1, calculate the standard enthalpy of formation of octane. The standard enthalpies of formation of carbon dioxi
A curve of radius 53.8 m is banked so that a car of mass 2.5 Mg traveling with uniform speed 56 km/hr can round the curve without relying on friction to keep it from slipping on the surface
Write the balanced equation for the reaction of aqueous Pb(ClO3)2 with aqueous NaI. Include phases.
Calculate the standard reaction enthalpy for the following reaction. N2H4(l) + H2(g) -----> 2NH3(g) Given: N2H4(l) + O2(g) -------> N2 (g) + 2H2O(g)
A 54.2 g block of copper whose temperature is 400 K is placed in an insulating box with a 120 g block of lead whose temperature is 200 K. What is the change in the entropy of the system
A Carnot engine operates between 235°C and 125°C, absorbing 6.30 ? 104 J per cycle at the higher temperature. How much work per cycle is this engine capable of performing
What is the pressure in atmospheres inside a container of gas connected to a mercury-filled open-end manometer when the level in the arm connected to the container is 28.0cm higher than the level in
An air conditioner operating between 86°F and 72°F is rated at 4000 Btu/h cooling capacity. What horsepower is required of the air conditioner motor
An electrochemical cell has an Eocell of 2.00 V and transfers 1 mole of electrons. The Faraday constant is 96,485 C/mol e-. What is the value of delta G
A water tower, vented to the atmosphere, is drained by a pipe that extends to the ground. what is the absolute pressure in the drain pipe at ground level
Use Slater's rules to calculate the shielding constant and effective nuclear charge for a 5s, 5p, and 4d electron in the tin atom. Which of these electron experience the lowest effective nuclear cha
A hydrogen atom in its ground state absorbs a UV photon at a wavelength of 93.8 nm. It then re-emits a photon as it relaxes to the n=2 energy level.
Consider an LC circuit with L = 13 mH and C = 2285 pF. At what frequency is the reactance of the inductor equal to the reactance of the capacitor
Calculate the standard reaction enthalpy for the oxidation of nitric acid to nitrogen dioxide, 2NO(g) + O2(g) ----> 2NO2(g) from the standard reaction enthalpies of
To what energy level was the electron initially excited. (b) What is the net energy absorbed or emitted by the atom (in units of eV) in the overall process
Three resistors with values 1.2 , 2.3 , and 5.0 , respectively, are connected in parallel in a circuit with a 5.0 V battery, what is the pwer delivered to the 5 ohm resistor
The HCl molecule has a bond length of 127 pm and has partial charges of (+)(-)0.177e. What is the dipole moment of the HCl molecule in units of Debye (D)
In a tennis serve, a 0.073-kg ball can be accelerated from rest to 41 m/s over a distance of 0.95 m. Find the magnitude of the average force exerted by the racket
A pendulum of mass 0.25 kg and length L= 1.0 m is attached to a line which is fixed at point P, determine the force of tension in the line
If the pressure is increased to 120 bar, the melting temperature increases to 375.88 K. Calculate DeltaHo fusion and Delta So fusion for this substance
One fires a bullet (m=50g) at a block of wood (m=2kg) resting on a frictionless surface. How much energy is lost
From the shore of a frozen lake, Eli Manning throws a 2 kg football at a velocity of 20 m/s. What is their velocity immediately after they catch it