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.
If 4.86 x 10-mol of 176W emits 1.07 x 1015B+ in 1.00 h, what is the decay constant? Enter your answer in scientific notation. 2.79 X 100 h-1
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
Question 9 (of 15) value: 1.00 points 2 attempts left Check my work What is the OH concentration of a 8.2 x 10-MH20* solution? Give your answer in scientific notation. Be sure to answer all parts. x 10 -
Consider a 2.41 mol sample of C 9 H 18 . How many atoms of H would be in this sample? Report your answer with 3 significant figures and in scientific notation.
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
7. value 0.00 points 3 attempts left Check my work Calculate the number of mol corresponding to 19.0 g Be. Enter your answer in the provided box. mol Be value 1.00 points 3 attempts left Check my work Calculate the number of mol corresponding to 0.065 kg Si. Enter your answer in the provided box. mol Si 9. value 0.00 points 3 attempts left Check my work What is the average molar mass of the following elements? Be sure to...
Question 1 (of 15) value 1.00 points 3 attempts left Check my work Be sure to answer all parts. Enter the your answers using scientific notation. Repo So Calculate the [H3O+] and [OH ] of a sodium hydroxide solution with a pH = 13.00. [H,0*]=C 10 (select) M [OH ]= * 10 (select) M Guided * Type here to search
A) What is the specific activity (in Ci/g) if 5.5 μg of an isotope emits 1.58x108 β- particles per minute? B) If 52 of the atoms of a radioactive isotope disintegrate each day, what is the decay constant of the process? Round answer to 4 decimal places