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If the activity of carbon-14 decay in an equal mass of living matter is 33.6 disintegrations per second, determine the age of the charcoal? The activity of radioactive carbon-14 decay of a piece of
Determine the half-life of 90Y. A freshly isolated sample of 90Y was found to have an activity of 9.7 x 105 disintegrations per minute at the 1:00 P.M. on December 3, 200
Determine the numbers of grams of dry NH4Cl required to be added to 2.50 L of a 0.700 M solution of ammonia, NH3, to prepare a buffer solution that has a PH of 8.81? Kb for ammonia is 1.8x10^-5.
What would you expect to happen to the absorbance reading if one does not wipe their fingerprint off from a curette before measuring the absorbance in a spec to photometer.
Suppose you conclude that the reaction order n=0 for a reaction with t half-life at 10 min, 20 min, and 40 min, because half-life is dependent on the concentration. But why can't the reaction be sec
Illustrate the probability envelopes for each of the 3d-orbitals. Make sure that you indicate the positions of the axes(x, y & z) and the sign of the wave function for each portion on t
Determine the numbers of grams of NaCH3COO must be added to 150.0 mL of a .150 M solution of CH3COOH to produce a buffer of pH4.75? Suppose that the volume will remain constant, pK A forCH3COOH = 4.75
Determine the ratio of ethyl a mine(CH3CH2NH2) to the ethyl ammonium ion (CH3CH2NH3+) in a solution with a pH of 11.0 pKa forCH3CH2NH3+ =10.636
The model N=10(4=3t) explains number of deer (N) in the park t years after 40 deer 1.25 are introduced into region. Approximately how long will it take deer population to reach 224?
Suppose one begins with 55.0 g of arsenic trioxide dissolved in water, and repeatedly dilutes the solution with pure water, each dilution reducing the amount of arsenic trioxide in the solution by a
Determine the percentage of K2O (94.20g/mole) in a fertilizer when a 0.4320 g sample gives 0.2138 g ofKB(C6H5)4 (358.2 g/mol). MM K =39.1 g/mole. Sodium tetraphenylborate, NaB(C6H5)4 is used as a
Cyclist rate was four times faster than walking rate. If time spent on cycling and walking was 5 hours at what rate was cyclist riding?
The problem is to calculate Initial hat energy of coldwater using equation m CpT, Cp=4/184J/g-C. Given 20 ml of water it is temperature is 21.00 C when adding 20ml of hot water at 100C it is initia
Determine the balanced equation for the reaction that occurs when the two half-cells are connected? Mn2+(aq) + 2e- ®Mn(s) Eo(red) = -1.18 V v/s SHE
Determine the molar volume of H2 at 35 degrees C and 2.50 atm? Determine the numbers of grams of H2 are present? Under these same conditions for H2, find out the volume of 131.3 g of Xe?
Determine the numbers of moles and liters of gas would be formed by reacting 77.5 g of NaHCO3 with excess vinegar? Suppose the reaction releases all the gas and that the reaction takes place at t
Suppose a hydrogen-oxygen fuel-cell generator was used to form the electricity for a house. Use the standard cell potential and the balanced redox reactions to predict the volume of hydrogen gas nee
A reaction mixture in a 10.00 liter flask contains 4.1 moles each of hydrogen and fluorine gases plus 3.4 moles of HF. When this mixture reaches equilibrium what will be the concentration of hydroge
Your response should list the letters for all correct answers in alphabetical order (for example: BFGH). Which of the following molecules or polyatomic ions have a dipole moment (that is, which mole
The rectangle floor of a closet is divided into two right triangles by drawing the diagnol. Length of closet is 2 feet more than twice the width. Diagnol is 13 feet. Find closet's length and width.
Assuming that the rate of decay is 13.6 counts per minute per gram, determine the age of the remnant in years. 14C has a half life of 5730 years. A humanoid skeleton was found to contain 14C with t
What is the percent iron (II) sulfate in the sample if a 1.818g sample containing iron(II) sulfate is dissolved and needs 34.1mL of 0.0115M K2Cr2O7solution to titrate it.
Find out the molarity of a sodium van date (Na3VO4) solution if 35.6mL of the solution are required to titrate a 0.659g sample of pure potassium sulfite ?
Calculate the molecular formula of the compound. A compound of P and F was analyzed as follows: Heating 0.2324 g of the compound in a 378 cm3 container turned all of it into gas, which has a pressur