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The solution diluted in half by water (1 mL of X and 1 mL of H2O) has an absorbance at 425 nm of 0.8 and a molar extinction coefficient of 1.5 ? 103 M-1 cm-1. What is the molar concentration of the
how would you make a 500 ml solution that is 10mM Tris, 2mM EDTA. The formula of Tris is 121.1, EDTA's FW is 187
A stunt man drives a car at a speed of 20m/s off a 30-m-high cliff, How far from the base of the cliff does the car land and What is the car's impact speed
What is the pH of 50 mL of .122M sodium glycinate titrated with .100M HCL at second equivalence point
For H3PO3, Ka1 = 1.0x10- 2and Ka2 = 2.6x10-7. Calculate a value for the [H2PO3] in a 0.500 molar solution of H3PO3
A ball is thrown toward a cliff of height h with a speed of 30m/s and an angle of 60? above horizontal, What was the maximum height of the ball
What volume (in mL) of water must be added to a 1.133 M solution of sodium chloride to make a 52.4 mL of a 0.52024 M solution? Assume the volumes are additive.
A slide projector needs to create a 86 cm high image of a 2.0 cm tall slide, What focal length does the lens need and How far should you place the lens from the slide
What is the concentration (in M) of the chloride ion when 16 mL of a 0.625 M solution of sodium chloride is combined with 17.3 mL of a 0.551 M solution of iron(III) chloride to a final volume of 56.
A sample of a radioisotope shows an activity of 999 disintegrations per minute due to beta decay. If after 1.10 years the activity is 952 disintegrations per minute, what is the half-life of this ra
Over a time interval of 2.16 years, the velocity of a planet orbiting a distant star reverses direction, Find the total change in the planet's velocity in m/s
What is the concentration of the sodium ion (in M) in a solution of 0.607 M sodium sulfate
How much heat (in J) is evolved or absorbed when a 36.9 g sample of water (specific heat = 4.18 J/(g K)) cools from 87.7oC to 79.2oC
A resistor is connected across the terminals of a 9 V battery, which delivers 1.27E+5 J of energy to the resistor in 8.00 hours
What is the total sample size (in grams) for a sample of lithium hydroxide which contains 3.66 g of oxygen
A baseball player hits the ball and it lands in the field seat 10 m above the point, find the c and y components of the initial velocity vector of the baseball
Use a table of standard thermodynamic values to predict the standard cell potential at 81 C: Cu(s)|CuSO4||AgNO3|Ag(s) Assume that the values of ?H and ?S are independent of temperature.
A sealed container of volume 0.10 m^3 holds a sample of 3.0 x 10^24 atoms of helium gas in equilibrium, Calculate the temperature and pressure of the helium gas
What is the concentration (in M) of the hydroxide ion when 19.4 mL of a 0.712 M solution of sodium hydroxide is combined with 15.9 mL of a 0.703 M solution of barium hydroxide? Assume the volumes ar
Consider a 0.200kg pendulum bob that is in an upright circular cylinder with a 0.0193 diameter, Draw a free body diagram and calculate the tension and the centripital acceleration at the bottom of the
Based on the sign of E°cell, classify these reactions as spontaneous or nonspontaneous as written. Assume standard conditions.
A 128-cm-long pipe is stopped at one end. Near the open end, there is a loudspeaker that is driven by an audio oscillator, What is the lowest frequency of the oscillator that will produce resonance wi
A chemical reaction at equilibrium is heated, briefly, by holding it over a flame. The equilibrium is seen to shift toward the products. What can be said about the enthalpy and entropy of the reacti
A coin is tossed upward with an initial speed of 7.5 m/s2, What is the total time it is in the air before returning yo it's releasing point
If you electrolyze 150. g CH3SO2F, how many grams of HF are required and how many grams of each product can be isolated