A chemist from the laboratory of an industry dedicated to the manufacture of anticorrosive pigments and requires preparing a solution of potassium dichromate (K2Cr2O7) at 6.5%(m/v) to perform some tests. Indicate step by step the procedure for its preparation.

Butadiene undergoes a reaction at a certain temperature in the gas phase as follows: 2c4h6(g) --> c8h12(g) the following data were collected for this reaction: time (min) [c4h6] (m) 0 0.36 15 0.30 30 0.25 48 0.19 75 0. determine the order of the reaction and the rate constant. 1st order and k = 4.3x10 -4 s-1 1st order and k = 2.3x10-4 s-1 2nd order and k = 4.3x10-4 s-1 2nd order and k = 2.3x10-4 s-1 zero and k = 4.3x10-4 s-1

Fill in the coefficients that will balance the following reaction: a0cr2(so4)3 + a1agno3

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.