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You are given 25 mL of 0.189438 M sodium acetate (NaC2H3O2) which has a pKb of 9.25 and are asked to titrate 0.2 M HCl into the solution. How many liters of HCl is needed to completely neutralize th
What is the mass of 1 magnesium is 1.04 grams/m length of magnesium ribbon used was 2 cm volume gas collected was 42.9 ml room temperature 23.5 *c room pressure761.75mmHg vaper presure of water 21.
You are given 25 mL of 0.10901 M acetic aid (C2H4O2) which has a pKa of 4.76 and are asked to titrate 0.2M NaOH into the solution. How many liters of NaOH is needed to completely neutralize the acid
Phosphorus-32 has a half-life of 14.0 days Starting with 6.00g of , how many grams will remain after 98.0 days ?
How much 0.20mol/L NaOH must be added to this buffer to raise the pH to 5.1? If the same amount of 0.20 mol/L NaOH were added to 250mL of deionized water,what would the new pH be?
A cell extract from a new species of Amoeba is used to translate a purified mouse hemoglobin mRNA, but only a short peptide is produced. What is the simplest explanation for this result?
An aqueous solution is made by dissolving 25.8 grams of magnesium nitrate in 395 grams of water. What is the molality of magnesium nitrate?
Suppose you have an unknown X that melts at 85-86oC and you do a mixture melting point with a known compound A that melts at 85-86oC. What results would be observed if?
Why is no voltage observed before the porous cup is immersed in the glass electrode jar?
Calculate the pH and the concentration of all species in solution at equilibrium for a 0.15 M solution of ascorbic acid, or H2C6H6O6. For ascorbic acid, Ka1 = 8.0 10^5 and Ka2 = 1.6 10^12
Find the change in kinetic energy of the object it its velocity changes so that its new x-component is 8.50 m/s and its new y-component is 5.00
The sequence or rRNA is highly conserved enven though there are mnay rRNA genes in the genome. How does this observation argue for a functional (NOT JUST STRUCTURAL) role for rRNA?
What is the kinetic energy in Joules of the emitted electrons when cesium is exposed to UV rays of frequency is 1.3 x 10^15 Hz?
A block with mass m1 slides on a frictionless horizontal table. It's connected to a block with mass m2 by a light cord that passes through a hole in the table, with m2 hanging vertically. What shoul
What is the concentration of H+ ions in a solution of hydrochloric acid that was prepared b diluting 50.0 mL of concentrated (11.6 M) HCl to a final volume of 500mL? Final answer in M units.
There is also a $1,000 fee that is paid to the University for the Right to sell these programs. If Katherine was able to sel1 programs for $5 each, how many would she have to sell in order to break
What is the concentration of ammonia in a solution if 20.0 mL of a 0.1145 M solution of HCl are needed to titrate a 100.0 mL sample of the solution?
A freight train consists of an engine and several identical cars on level ground. Determine whether each of the statements are true or false then explain. A) if the train is moving at a constant spe
Two hypothetical ionic compounds are discovered with the chemical formulas XCl2 and YCl2, where X and Y represent symbols of the imaginary elements. Chemical analysis of the two compounds reveals th
What makes water so different from other small molecules that have a similar mass, such as methane (CH4), carbon monoxide (CO), and hydrogen sulfide (H2S), all gases?
A 200 weather rocket is loaded with 100 of fuel and fired straight up. It accelerates upward at 30m/s^2 for 33s , then runs out of fuel. Ignore any air resistance effects.....what is the rocket's ma
The affinity of a ribosome for a tRNA in the P site is about 50 times higher for a tRNA in the A site. Explain why this promotes translational accuracy.
In a gas mixture, the partial pressures are argon 425 , neon 60 , and nitrogen 125. What is the total pressure exerted by the gas mixture?
A chair of weight 110 N lies atop a horizontal floor; the floor is not frictionless. You push on the chair with a force of F = 45.0 N directed at an angle of 34.0 degrees celsius below the horizonta
A gas sample was collected over water at 25.3 degrees Celsius, The total pressure is determined to be 0.97 atm. What is the partial pressure of the gas that was collected?