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the distance between the atoms of H-I is 1.61 A. What is the distance in meters. What is the charge associated with each side of the HI molecule
Th-232 has a half-life of 1.39 x 10^10 years old. A certain rock has a Pb-208/Th-232 mass ratio of 0.25/1.00. Estimate the age of the rock.
Calculate the minimum mass of Pu-238 (in kilograms) that would had to have been loaded on the spacecraft at the time of its launch from earth.
Suppose 11.78 mL of the same thiosulfate solution reacts with the iodine replaced by 20.00 mL of an unknown solution of sodium hypochlorite. Calculate the weight, in grams, of available Cl in a lite
Rubidium-87 decays by beta decay with a half-life of 4.9 x 10^10 yr. How many 87Rb atoms are in a moon rock sample that has a rubidium decay rate of 3500 disintegrations per hour
What would the atom ratio of 206Pb to238U be in a uranium mineral from a rock that is 1.0× 10^9 years old? t1/2(238U)= 4.5 × 10^9 yr.
Present-day plant life has a carbon-14 decay rate of 16 disintegrations per minute (dpm) per gram of carbon. If a contemporary wooden chair were somehow preserved for the next 3,900 years, what 14C
A certain antacid contains only Al(OH)3 (FW=78.00) and Mg(OH)2 (FW=58.33). If a 0.2678 g sample of the antacid requires 10.25 mL of 0.9815 M HNO3 for neutralization, what is the % by mass of Al(OH)3
When a solution of a certain gadolinium salt ie electrolyzed with current of 1.0 A for 2.0 h, 0.025 mol of Gd metal forms. Calculate the charge on the gadolinium ion in the salt
Consider the reaction Pb(s) + 2H^+(aq) ? Pb^2+(aq) + H2(g). If the hydrogen gas pressure is maintained at 1.00 atm and the lead(II) ion concentration is 0.025 M, find the pH at which this reaction i
What is the osmotic pressure, in atm, of a solution formed by dissolving 17.8 g of PbCl4 in 0.250 L of water at 64.4 oC? (R = 0.0821 L-atm/mol-K; 0 oC = 273 K)
A gas mixture contains 76% nitrogen and 24% oxygen. If the total pressure is 1.16 atm what are the partial pressures of each component
What is the temperature of 0.600 mol of gas at a pressure of 1.5 atm and a volume of 12.1 L
The pressure of the gas is 365 torr, and the temperature is 45, ^{\circ}C. If the temperature changes to 60\, ^{\circ}C with no change in volume or amount of gas, what is the new pressure, P_2, of t
Consider 4.00 rm L of a gas at 365 rm mmHg and 20. rm ^{circ}C . If the container is compressed to 3.00 rm L and the temperature is increased to 36, rm ^{circ}C, what is the new pressure, P_2, insid
The next day you notice that some of the gas has leaked out. The pressure and temperature remain the same, but the volume has changed to 15.0 L. How many moles of gas (n_2) remain in the cylinder
calculate the SCF energies and the relative energies of the keto and enol tautomers of ethanal(acetaldehyde) in Kcal/mole
Calculate the probability of finding the electron in a spherical shell defined by 10.95a0 ? r ?11.05a0
Calculate the vapor pressure of water, in torr, above a solution prepared by dissolving 65.40 g of ZnCl2 in 445.0 g of water at 323.0 K. The vapor pressure of pure water at 323.0 K is 92.50 torr.
Draw the structure for the major product formed when cyclohexanone reacts with each of the following- hydrazine, then hot, fused KOH
Complete and balance the following redox equation using the smallest whole-number coefficients. Show the steps. Sn (s) + HNO3 --> SnO2 (s) + NO2 + H2O (not balanced, assume acidic solution)
Which solvent displayed the strongest propensity to encourage keto-enol tautomerization. CHCl3, DMSO, CH3OH? Or does this propensity more closely follow the type of solvent it falls under (such as n
Calculate the pH at each point listed for the titration of 25.00 mL of 0.1000 M formic acid with 0.1000 M KOH. The points to calculate are Vb = 0.00, 12.50 and 25.00 mL
Write charge and mass balances for aqueous Ca3(PO4)2if the species are Ca2+, CaOH+, CaPO4-,PO43-, HPO42-, H2PO4-and H3PO4
Draw N-ethyl-3-methylpentanamide. Draw your structural formula with all necessary hydrogen atoms.