Chemistry, 07.05.2021 20:00 brooke012002
An ancient club is found that contains 140 g of pure carbon and has an activity of 4.5 decays per second. Determine its age assuming that in living trees the ratio of atoms is about . Note that the half life of carbon-14 is 5700 years and the Avogadro number is . years 2. One of the many isotopes used in cancer treatment is , with a half-life of 2.70 d. Determine the mass of this isotope that is required to give an activity of 205 Ci. mg 3. The radioactive isotope ( Mo) has a half-life of 2.75 days. A sample containing this isotope has an initial activity at (t
Answers: 2
Chemistry, 22.06.2019 10:00
The reactions shown here can be combined to make the overall reaction c(s) + h2o(g) ⇌ co(g) + h2(g) by reversing some and/or dividing all the coefficients by a number. a. c(s) + o2(g) → co2(g) k=1.363×10^69 b. 2 h2(g) + o2(g) → 2 h2o(g) k=1.389×10^80 c. 2co(g) + o2 (g) → 2 co2(g) k=1.477×10^90
Answers: 1
Chemistry, 22.06.2019 19:50
Identify the lewis base in this balanced equation: fe3+ h2o fe(h2o)63+
Answers: 1
Chemistry, 22.06.2019 21:50
If e is the symbol for an element, which two of the following symbols represent isotopes of the same element? 1. e2. e3. ea.1 and 2c.1 and 4b.3 and 4d.2 and 3
Answers: 2
Chemistry, 23.06.2019 02:20
In a chemical reaction, the final amount of the products is determined by the a. universal gas law b. law of definite proportions c. air pressure d. temperature e. none of the above me
Answers: 2
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