BaCl² produces barium gas plus chlorine gas when heated. what would be the combined mass of the barium and chlorine if 15 g of Barium chloride was heated​

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

How many moles of air are there in a human lung with a volume of 2.4 l at stp? explain your answer

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?