Question 17 Not answered Marked out of 1.00 Flag When formic acid is heated, it

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Question 17 Not answered Marked out of 1.00 Flag 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 (tor) 379 408 100. 150 200 .423 250 ..431 300.. 435 At the start of the reaction (time O), only formic acid is present. What is the formic acid pressure (in torr) when the total pressure is 4061? Hint: use Daiton's law of partial pressure which states total pressure when you have a mixture of gases a A and B, is given by the expression, P PA PB, and the reaction stoichiometry

Explanation / Answer

         H-COOH(g) ----> CO2(g) + H2(g)

initial 220 torr         0        0

change    -x              +x       +x

finally 220-x          x        x

Total pressure = 220-x+x+x

             406 = 220+x

   x = 186

formic acid pressure = 220-186 = 24 torr  

Co2 pressure = x =186 torr

   H2 pressure = x = 186 torr

         H-COOH(g) ----> CO2(g) + H2(g)

initial 220 torr         0        0

change    -x              +x       +x

finally 220-x          x        x

Total pressure = 220-x+x+x

             406 = 220+x

   x = 186

formic acid pressure = 220-186 = 24 torr  

Co2 pressure = x =186 torr

   H2 pressure = x = 186 torr

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