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Radioactive carbon-14 has a half life of 5730 years. Suppouse a peice of wood has a decay rate of 15 disingrations per minute. How many years would it taker for the rate of decrease to 4 disintegrations per minute?
Copper is obtained from ores containing the minerals, azurite,Cu3(CO3)(OH)2, chalcocite, Cu2S, chalcopyrite CuFeS2
Rank each of the following measurements from smallest to largest
The box is then heated to 500K, which causes the ammonia to partially decompose to Nitrogen and Hydrogen and results in a final pressure of 4.85*10^6 pa. Find the number of moles and partial pressure of all three gases at 500K. What is the average..
Which reagent would be best for achieving an E2 elimination of 3-chloropentane? a. C2H5OH b. CH3CO2Na c. NaHCO3 d. NaI
Calculate the grams of solid Na2HPO4 that should be added to a 0.50M NaH2PO4 solution to make 50 mL of a buffer with a pH of 7.4; the ka for the NaH2PO4 is 6.2X10^-8
The pH of a bicarbonate-carbonic acid buffer is 8.50. Calculate the ratio of the concentration of carbonic acid (H2CO3) to that of the bicarbonate ion (HCO3-).
An unkown metal crytallizes in one of the three cubic lattices. The edge length of the unit cell is 408pm. Given that the atomic radius of the metal is 144pm and the density of the solid is 19.3g/cm-3, what is the atomic symbol of the metal? a=2R ..
An aqueous solution made by dissolving 168 mg of an unknown compound (a nonelectrolyte) in enough water to make 500.0 mL of solution, develops an osmotic pressure of 5.22 torr at a temperature of 23.5 °C. What is the molecular weight of this unkno..
Nitrogen triflouride decomposes to form nitrogen and flourine gases according to the following equation: 2NF3 (g) N2(g) + 3F2(g) when 2.06 mol of NF3 is placed in a 2.00-lcontainer and allowed to come to equalibriumk at 800k,
calculate the empirical formula for the bismuth oxide, 89.7% Bi and 10.3 O. and percent composition
Which value is closest to the pOH of a 0.30M solution of the weak base methylamine (CH_3_NH_2_). The Ka for the acid form of methylamine (CH_3_NH_3_+) is 2.27E-11.
How many grams of CO2 are formed by the complete reaction of 33.7 g of limestone. What is the volume in liters of this CO2 at STP
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