
If 4.86 x 10-mol of 176W emits 1.07 x 1015B+ in 1.00 h, what is the...
If 4.42 × 10−9 mol of 176W emits 1.07 × 10^15 β+ in 1.00 h, what is the decay constant? Enter your answer in scientific notation.
Please show your work. (Note:
1.08 is incorrect, but the 10-1 is
correct.)
Be sure to answer all parts. If 5.01 x 10-9 mol of 176w emits 1.07 x 1015 β+ in 1.00 h, what is the decay constant? Enter your answer in scientific notation. 1.08 x 10 h1 -1 h-l
Be sure to answer all parts of the question: a. A fabric remnant from a burial site has a 14C/12C ratio of 0.655 of the original value. How old is the fabric? ____ yr b. If 5.01 × 10−9 mol of 176W emits 1.07 × 1015 β+ in 1.00 h, what is the decay constant? Enter your answer in scientific notation. ____ × 10___ h−1
What is the specific activity (in Bg/g) if 5.53 kg of an isotope emits 3.77 x 107 Enter your answer in scientific notation. particles per minute?
Methanol, ethanol, and n-propanol are three common alcohols. When 1.00 g of each of these alcohols is burned in air, heat is liberated as indicated. Calculate the heats of combustion of these alcohols in k.J/mol. (a) methanol (CH3OH, -22.6 kJ k.J/mol (b) ethanol (C2HsOH), -29.7 kJ Enter your answer in scientific notation. X 10 k.J/mol (c) n-propanol (C3H7OH),-33.4 kJ Enter your answer in scientific notation. x 10kJ/mol
Be sure to answer all parts. The rate constant of a reaction is 4.2 x 10's at 25°C, and the activation energy is 33.6 kJ/mol. What is k at 75°C? Enter your answer in scientific notation. *10 ,1
Be sure to answer all parts. The rate constant of a reaction is 2.80 x 10 5 L/mol's at 195°C and 6.70 x 10" L/molts at 258°C. What is the activation energy of the reaction? Enter your answer in scientific notation. x 10_J/mol
Be sure to answer all parts. The rate constant of a reaction is 3.2 x 10-5 at 25°C, and the activation energy is 33.6 kJ/mol. What is k at 75°C? Enter your answer in scientific notation. 1.0259972
During the experiment you use a cell with a path length of 1.00 cm. On the instrument the recorded absorbance is 0.277 for solution # 1. Knowing the absorptivity constant of FeSCN2+is 4700 L mol -1 cm-1 at the wavelength used, calculate the concentration of FeSCN2+in solution #1. You answer should be in M and in scientific notation. _ . _ _ x 10 -5 M (if your answer was 9.99 x 10 -5 M, input your answer as 9.99)...
Determine the age of a rock containing 0.065 g of uranium-238 (t12 = 4.5 x 10°yr) and 0.043 g of lead-206. (Assume all the lead-206 came from 238U decay.) Enter your answer in scientific notation. 2 68 x 10 irs old h