Author Question: Carbon-14, which is present in all living tissue, radioactively decays via a first-order process. A ... (Read 61 times)

ARLKQ · **on:** Nov 18, 2019

Question 1

For the first-order reaction, 2N2O(g) → 2N2(g) + O2(g), what is the concentration of N2O after 3 half-lives if

mol of N2O is initially placed into a 1.00 L reaction vessel?
◦ 1.2 × 10-1 mol L-1
◦ 6.2 × 10-2 mol L-1
◦ 3.1 × 10-2 mol L-1
◦ 1.6 × 10-2 mol L-1

Question 2

Carbon-14, which is present in all living tissue, radioactively decays via a first-order process. A one-gram sample of wood taken from a living tree gives a rate for carbon-14 decay of 13.6 counts per minute. If the half-life for carbon-14 is 5720 years, how old is a wood sample that gives a rate for carbon-14 decay of 11.9 counts per minute?
◦ 7.6 × 102 yr
◦ 9.4 × 103 yr
◦ 5.3 × 102 yr
◦ 1.1 × 103 yr

Andromeda18 · **Reply #1 on:** Nov 18, 2019

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