I have the answer to the first problem cant find the last two When formic acid i
ID: 805232 • Letter: I
Question
I have the answer to the first problem cant find the last two
When formic acid is heated, it decomposes to hydrogen and carbon dioxide in a first-order decay:
HCOOH(g) ?CO2(g) + H2 (g)
The rate of reaction is monitored by measuring the total pressure in the reaction container.
Time (s) . . . P (torr)
0 . . . . . . . . . 220
50 . . . . . . . . 324
100 . . . . . . . 379
150 . . . . . . . 408
200 . . . . . . . 423
250 . . . . . . . 431
300 . . . . . . . 435
At the start of the reaction (time = 0), only formic acid is present. What is the formic acid pressure (in torr) when the total pressure is 359? Hint: use Dalton's law of partial pressure and the reaction stoichiometry.
Answer: 81
2. What is the rate constant (in s-1)? (To determine the rate, you must use a reactant concentration or pressure. Use the procedure of in the previous question to determine the HCOOH pressure as a function of the total pressure.)
3.What is the half-life (in s)?
Explanation / Answer
2) rate constant k = 2.303/t log(a/a-x)
k= 7.83 x 10^-3 s-1
3) t1/2 = 0.693/k = 88.5 x 10^3 s.