Decomposition of Formic Acid?

[匿名]

2020-09-09 10:46 am

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 364? Hint: use Dalton's law of partial pressure and the reaction stoichiometry.

回答 (1)

賣女孩的火柴

2020-09-09 1:32 pm

✔ 最佳答案

Equation:          HCOOH(g) → CO₂(g) + H₂(g)
At time = 0 (torr):     220              0      0
Change (torr):   -y      +y    +y
At time = t (torr): (220 - y)       y            y

When total pressure = 364 torr:
(220 - y) + y + y = 364
220 + y = 364
y = 144

When total pressure is 364 torr, formic acid pressure
= (220 - 144) torr
= 76 torr

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