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A student placed 10.5 of glucose () in a volumetric flask, added enough water to dissolve the glucose by swirling, then carefully added additional water until the 100.- mark on the neck of the flask was reached. The flask was then shaken until the solution was uniform. A 30.0-mL sample of this glucose solution was diluted to 0.500 L. How many grams of glucose are in 100. mL of the final solution?
Suppose that you have a 2.0 L sample of hydrogen at 1.00 atm and 59°C. If you heat the sample to 84°C and it expands to a volume of 3.7 L, what will the final pressure be?
Gases azomethane decomposes in a first order reaction when heated: CH3NNCH3 --> N2 + C2H6. The rate constant is 0.0216 min-1. If the initial quantity of azomethane in the flask is 2.00 g, how much remains after 0.0500 hour
An unknown solution containing one of the salts ZnSO4, MgSO4 or SrCl2 gives a negative flame test but tarnishes a piece of magnesium inserted into the solution. Which salt was in the solution
If an automobile is able to travel 247 mi on 10.8 gal of gasoline, what is the gas mileage in km/L.
Calculate the de Broglie wavelength of a 143g- baseball traveling at 90mph ?
The dipole moment (u) of HBr (a polar covalent molecule) is 0.82 D (debye), and its percent ionic character is 12.1% Estimate the bond length of the HBr bond in picometers.
A certain weak base has a Kb of 7.30 × 10-7. What concentration of this base will produce a pH of 10.07
What combination of a molecular base (that is a neutral compound, not an ion!) and a salt of the conjugate acid of that molecular base should you select to prepare a buffer solution that would maintain a pH of 9.00? For full credit, explain
add the angular wave function for a 2s electron of carbon to that of a 2py electron of the same carbon atom. subtract
What is the M/z ratio of the Molecular Ion Peak(s). What fragment was removed from the molecule to produce the Base Peak", and what was its mass
What is the total energy of the photons detected in a period of one hour If a radiation detector is capturing 8 X 10^7 photons per second at this wavelength,?
When ammonium chloride, NH4Cl, dissolves in water, the temperature of the solution is found to be less than that of the original water sample.
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