The rate constant for this first-order reaction is 0.0265 s − 1 at 300 °C. A ⟶ products If the initial mass of A is 16.74 g, calculate the mass of A remaining after 1.27 min.

Answer : The mass of A remaining after 1.27 min is, 13.7 grams

Explanation :

Expression for rate law for first order kinetics is given by:

where,

k = rate constant  =

t = time passed by the sample  = 1.27 min = 76.2 s   (1 min = 60 s)

a =  initial amount of the reactant  = 16.74 g

a - x = amount left after decay process = ?

Now put all the given values in above equation, we get

Therefore, the mass of A remaining after 1.27 min is, 13.7 grams

adding or remove a gaseous reactant or product changes the concentrations. if the concentration of reactant or product is increased, the system will shift away from the side in which concentration was increased (i.e. if the concentration of reactants is increased, the system will shift toward the products. if more products are added, the system will shift to form more reactants). conversely, if the concentration of reactant or product is decreased, the system will shift toward the side in which concentration was decreased (i.e. if reactants are removed, the system will shift to form more reactants. if the concentration of products is decreased, the equilibrium will shift toward the products).

explanation:

i think the answer is terrae but not 100 percent sure. ▓▬▬ §