chemistry class

A flask is charged with 0.124 mol of A and allowed to react to form B according to the reaction A(g) → B(g). The following data are
obtained for (A) as the reaction proceeds:

Time (s) 1 10 20 30 40
Moles of A 0.124 0.110 0.088 0.073 0.054

1) The average rate of disappearance of A between 10 s and 20 s is __________ mol/s.
answer: 2.2 × 10-3


2) If the rate law for the reaction
2A + 3B → products
is second order in A and first order in B, then the rate law is rate = __________.
answer: k(A)2(B)

i know the answers but how do i figure problems like the above? i have a bunch of similar problems to figure out.

  1. 0
  2. 0
  3. 13
asked by tere
  1. 10 sec, 0.110
    20 sec, 0.088
    0.110-0.088 = 0.022 moles/10 sec = 0.0022 moles/sec.

    rate constant = k[A]x[B]y
    where x is the order of A and y is the order of B and [A] and [B] are the concentrations, in moles/L, of the reactants. Except for elementary reactions, the order CAN NOT be determined from the coefficients in the balanced equation. x and y must be determined experimentally.

    1. 0
    2. 0
    posted by DrBob222
  2. thank you i kept getting 0.022 because i didn't divide by time.

    1. 0
    2. 0
    posted by tere

Respond to this Question

First Name

Your Response

Similar Questions

  1. chemistry

    A flask is charged with 0.124 mol of A and allowed to react to form B according to the reaction A(g) →B(g). The following data are obtained for [ A ] as the reaction proceeds: Time (s) 1 10 20 30 40 Moles of A 0.124 0.110 0.088

    asked by JES on November 1, 2010
  2. Chemistry

    1. A solution containing 0.100 mol of Na2CO3 and 0.100 mol of NiCl2 is allowed to react. Which reactant is the limiting reactant? 2. A solution containing 0.100 mol of Na2CO3 and 0.100 mol of NiCl2 is allowed to react. How many

    asked by Eagertolearn on February 24, 2013
  3. Chemistry

    Carbon monoxide and hydrogen react according to the equation: CO(g) + 3H2(g) CH4(g) + H2O When 1.00 mol CO and 3.00 mol H2 are placed in a 1L flask at 1200K and allowed to come to equilibrium, the reaction mixture is found to

    asked by Emily on April 29, 2015
  4. Chemistry

    Equimolar amounts of gas A and B, each at an initial partial pressure of 1.00 atm are combined in a flask. The flask is sealed and allowed to react to completion according to the reaction: 2A(g)+ B(g) --> C(g) What is the final

    asked by DJS on January 2, 2014
  5. Chemistry - Chemical Equilibrium

    A sample of NH4HS(s) is placed in a 2.61 −L flask containing 0.120 mol NH3(g). NH4HS(s)⇌NH3(g)+H2S(g) KP=0.108 at 25∘C What will be the total gas pressure when equilibrium is established at 25∘C? Express your answer using

    asked by Jasper on February 17, 2018
  6. Chemistry II

    The equlibrium constant Kc for the reaction: has the value of 4.00 at 500K. If a mixture of 1.00 mol CO and 1.00 mol H2O is allowed to reach equilibrium at this temperature in a 1.00L flask, calculate the equilibrium

    asked by curtis on April 11, 2010
  7. chemistry

    nitrogen gas reacts with hydrogen gas to form ammonia. The nitrogen gas is in a closed 500.0 mL flask at 751 mm HG connected to a 1.25 L flask containing the hydrogen gas at 1.21 atm pressure. Both flasks are kept at 37C. if the

    asked by anonymous on April 10, 2013
  8. chemistry

    Ammonia and oxygen react to form nitrogen and water. 4NH3(g)+3 O2(g)-2N2(g)+6H2O(g) a.How many grams of O2 are needed to react with 8.00 mol NH3? 8.00 mol NH3 x42.094/4 mol NH3 x32.00 O2/1 mol O2=269gO2

    asked by Ana on June 25, 2010
  9. chemistry

    Ammonia and oxygen react to form nitrogen and water. 4NH3(g)+3 O2(g)-2N2(g)+6H2O(g) a.How many grams of O2 are needed to react with 8.00 mol NH3? 8.00 mol NH3 x42.094/4 mol NH3 x32.00 O2/1 mol O2=269gO2

    asked by Ana on June 25, 2010
  10. chemistry

    ogen and oxygen react to form nitrous oxide as: 2 N2 (g) + O2 (g) ⇌ 2 N2O (g) Of a mixture of 0.482 mol N2 and 0.933 mol O2 is placed in a reaction vessel of 10.0 L and allowed to from N2O at a temperature for which Kc = 2.0 X

    asked by Marwan on December 7, 2016

More Similar Questions