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160 mL that contains 400 mg of NH3 and 980 mg of NH4NO3. (Given: Kb (NH3) = 1.8 x 10-5. What is the pH of this solution after 80 mg of NaOH (s) are added?
If the volumes in the buret and the flask are identical and the concentration of the acid in the buret is 0.250 M, what is the concentration of the base in the flask?
An 8.00 g bullet is fired into a 220 g block that is initially at rest at the edge of a table of 1.00 m height. The bullet remains in the block, and after the impact the block lands d = 1.6 m from t
The balloon is released and reaches an altitude of 6.5 km, where the pressure is 0.5 atm. If the temperature has remained the same, what volume does the gas occupy at this height?
A container of water is heated from 23.5C to 85.0C. This process requires 21,900 Joules of heat. Calculate the mass of the water. (c=4.184 J/g-C)
Calculate the minimum difference in standard electrode potentials needed to lower the concentration of the metal M 1 to 2.0x10-4M in a solution that is 1.0x10-1 M in the lessreducible metal M2 wher
Calculate the number of kg of coal needed to produce the same amount of energy as the fission of 1 kg of U-235 (235.05g/mol).
a mixture of 70 mole% butane and 30 mole % hyrdrogen is burned with excess air. Fractional conversion of 85% of the butane and 90% of the hydrogen are achieved; of the butane that reacts, 95% goes t
Compute E0 for the process Ni(CN)4 2- + 2e = Ni(s) + 4CNGiven that the formation constant for the complex is 1.0x1022
A 325-mL sample of solution contains 25.3 g of CaCl2, which is fully dissolved. (a) Calculate the molar concentration of Cl- in this solution. (b) How many grams of Cl- are in 0.100 L of this soluti
Clay pigeons can be thrown vertically with an initial velocity of 6 m/s. How much time must elapse between throws if a second pigeon is to collide with the first 1.2 m above the point of release?
Note that in this question, rates of change can be positive or negative. Determine the following rates at a time when the rate of change of O2 is -3.16e-03 M/s.
A motorist is traveling at 16 m/s when he sees a deer in the road 38 m ahead. If the maximum negative acceleration of the vehicle is -5 m/s2, what is the maximum reaction time of the motorist that w
In a concentration calculation, if we are given the moles of solute and the grams of solvent, what do we need to do first in order to find the molality?
Four ice cubes at exactly 0 having a total mass of 53.0 are combined with 115 of water at 74 in an insulated container. If no heat is lost to the surroundings, what will be the final temperature of
A certain loudspeaker has a diameter of 44 cm. At what frequency will the wavelength of the sound it emits in air be equal to its diameter? Figure out the answer in Hz, but do not enter units. (Note
A volume of 12.66 mL of 0.1090 M NaOH solution was used to titrate a 0.771 g sample of unknown containing HC3H5O3. What is the percent by mass of HC3H5O3 in the unknown?
An aqueous solution of etanol, C2H5OH is 19% ethanol by mass and has density of 0.9700gml. Calculate the molality, molarity of the ethanol solution.
A ship sets out to sail to a point 107 km due north. An unexpected storm blows the ship to a point 126 km due east of its starting point. In what direction (as an angle from due east, where north of
Suppose 317 mL of 4.14 M HCIO4 Solution is added to enough water to make a total of 7.70 L. What is the molarity of HCIO4 in this new solution?
When you see a traffic light turn red you apply the brakes until you come to a stop. If your initial speed was 12m/s, and you were heading due west, what was your average velocity during braking? as
At a particular instant in time a particle has a velocity of 6.00 m/s. Over the next 4.00 s it experiences an average acceleration of -3.00 m/s2. Determine its velocity at the end of this three-sec
The rate constant for a certain chemical reaction is 0.00250 M1 s1 at 25.0C and 0.0125 M1s1 at 50.0C. What is the activation energy for the reaction, expressed in kJ mol?
To give a 22- child a ride, two teenagers pull on a 3.8- sled with ropes, as indicated in the figure . Both teenagers pull with a force of 55 at an angle of 35 relative to the forward direction, whi
Describe how the processes of transportation, deposition, and lithification influence the character of sediments. Use three detrital (clastic) and two chemical (non-clastic) rocks to illustrate.