Predicting relative forward and reverse rates of reaction Hydrogen and chlorine
ID: 704223 • Letter: P
Question
Predicting relative forward and reverse rates of reaction Hydrogen and chlorine react to form hydrogen chloride, like this: H2(g)+ Cl 2(g) ? 2 HCI (g) Imagine 54. mmol of H2 and 54. mmol of Cl2 are added to an empty flask, and then answer the following questions. ? Zero. What is the rate of the forward Greater than zero, but less than the rate of the reverse reaction. Greater than zero, and equal to the rate of the reverse reaction. Greater than zero, and greater than the rate of the reverse reaction. reaction before any H2 or Clh has been added to the flask? O Zero. What is the rate of the forward reaction just after the H2 or Cl2 has been added to the flask? than Greater than zero, but less than the rate of the reverse reaction. Greater than zero, and equal to the rate of the reverse reaction. Greater than zero, and greater than the rate of the reverse reaction. Zero. Greater than zero, but less than the rate of the reverse reaction. Greater than zero, and equal to the rate of the reverse reaction. Greater than zero, and greater than the rate of the reverse reaction. None Some, but less than 54, mmol 54. mmol. More than 54. mmol. H2 or Cl2 has What is the rate of the forward reaction at equilibrium? How much H2 is in the flask at equilibrium? ExplanationExplanation / Answer
1). Before the addition of H2 and Cl2 the rate of forward reaction is zero because there is no driving force to proceed the reaction
2). The rate of forward reaction is at it's maximum when reactants are mixed the rate of forward reaction is greater then zero and also greater than the rate of backward/ reversed reaction
3). At equilibrium the rate of forward and backward/reversed reaction is same thus the rate of forward reaction is still greater then zero but it became equal to reverse reaction
4). At the equilibrium the the concentration of reactant and product is same thus at the equilibrium position H2 won't complete react with Cl2 but some of H2 is still present in the flask it's concentration is less then 54 mmol