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If I burn 0.315 moles of hexane (C6H14) in a calorimeter containing 5.65 liters of water, what's the molar heat of combustion of hexane is the water temperature rises 55.4 ºC?
A car whose mass is 1600 kg (including the driver) has a maximum acceleration of 1.2 m/s2. If three passengers, each has a mass of 80kg are also in the car, what is the acceleration?
The thickness of a dollar bill is 0.15 mm. What is the height, in light-years of a stack of Avogadro's number of dollar bills? (Hint: 1 light-year is the distance that light travels in exactly 1 yea
A magnetic computer disk 9.40 cm in diameter is initially at rest. A small dot is painted on the edge of the disk. The disk accelerates 680.0 rad/s2 for 0.500s, then coasts at a steady angular veloc
If a bottle of nail polish remover contains 150 grams of acetone, how much heat would be released by its complete combustion?
Ann is driving down a street at 54 km/h. Suddenly a child runs into the street. If it takes Ann 0.744 s to react and apply the brakes, how far will she have moved before she begins to slow down?
If you are given a 0.33 g piece of sodium metal to react with water, how many moles of HCl would it take to neutralize the sodium hydroxide produced?
Consider a solution that is 0.10 M in a weak triprotic acid which is represented by the gen- eral formula H3A with the following ionization constants: K1 = 1.0 × 10-3, K2 = 1.0 × 10-8, K
A molecule of chlorine dioxide (ClO2) at 25oC has a velocity of 306 m/s. What is the kinetic energy in joules of the molecule at this temperature?
Compute the mass (in units of solar masses) of Sgr A* implied by the new results. Do the two stars give a consistent answer?
Assume that patient blood lead levels are 0.580 mg/L, that total blood volume is 5.1 L, and that 1 mol of succimer binds 1 mol of lead. What minimum mass of succimer in milligrams is needed to
Some of the sulfur dioxide ends up as sulfuric acid ( H2SO4) in acid rain. What mass,in grams, of sulfur dioxide is needed to react with 37.50 moles of oxygen?
A calorimeter contains 29.0 mL of water at 12.0, ^{circ}C. When 2.50 g of rm X (a substance with a molar mass of 50.0 g/mol) is added, it dissolves via the reaction
An AM radio station broadcasts with a power of 28.0kW at a frequency of 890kHz. Estimate the intensity of the radio wave at a point 13.0km from the broadcast antenna.
Give the names and charges of the cation in each of the following compounds: CuS, Ag2SO4, Al(ClO3)3, Co(OH)2, PbCO3. Express your answers as ions separated by commas.
If the backpack begins to slide when the spring ( = 140 ) stretches by 2.50 , what is the coefficient of static friction between the backpack and the table?
what is the end value of n in a hydrogen atom transition, if the electron starts in n=2 and the atom absorbs a photon of light with a frequency of 4.57*10^14 Hz?
An aqueous soultion of uknown salt of ruthenium is electrolyzed by a current of 2.50 amps passing for 50 min. if 2.618 g Ru is produced at the cathode, what is the charge on the ruthenium ions in s
A firefighter of mass 69 kg slides down a vertical pole with an acceleration of 3 m/s2. The acceleration of gravity is 10 m/s2 . What is the friction force that acts on him? Answer in units of N.
The He is used to fill balloons to a volume of 2.50 L at 732 mm Hg and 27 degree C. How many balloons can be filled with He?
A chemist dissolves 0.099 g of CuSO4 · 5 H2O in water and dilutes the solution to the mark in a 500-mL volumetric flask. A 36.1-mL sample of this solution is then transferred to a second 500-
A solution made by adding .106 mol of CH3COOH to 1.0 kg of water is found to freeze at -.203 C. Calculate the percent of the acid that has undergone ionization.
What is the value of q for the overall change from State A (through States B and C) to State D?
Give the strucures of the aldol products the form when each of the following compounds or mixtures is treated with NaOH.
What volume of oxygen gas at 25 degrees Celcius and 1.00 atm is produced from the decomposition of 22.33 mL of a 30.0% (by mass) solution of hydrogen peroxide?