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Phosphorus -32 has a half life of 14.0 days. Starting with 6.00 g of 32P, how many grams will remain after 70 days?
Explain how this could be done. How much 0.20 mol L^(-1) NaOH must be added to this buffer to raise the pH to 5.1? If the same amount of 0.20 mol L^(-1) NaOH.
Calculate the pH of a solution made by adding 67 g of sodium acetate, NaCH3COO, to 37 g of acetic acid, CH3COOH, and dissolving in water to make 300. mL of solution .
in order to change the volume of an 800ml sample of a gas 274k to 400ml, what temperature (in celsius) must be reached, assuming the pressure is kept constant?
What is the new boiling point point of water if you add 188 grams of magnesium chloride to 1250 g of water?
Fireflies flash at a rate that depends on temperature. At 29o C the average rate is 3.3 flashes every 10 seconds; at 23oC the average rate falls to 2.7 flashes every 10 seconds. Calculate the activa
Calculate the amount of energy in kilojoules needed to change 423g of water ice at -10 deg c to steam at 125 deg c .
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
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?
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?
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?
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.