Find the average atomic mass for boron if 19.9% of boron atoms have a mass of 10.0129371 amu and 80.1% have a mass of 11.0093055 amu. Round to 3 significant figures.

Average atomic mass  = 10.8  amu

Explanation:

Given data:

Average atomic mass = ?

Percentage of boron having mass 10.0129371 amu = 19.9%

Percentage of boron having mass 11.0093055 amu = 80.1%

Solution:

Average atomic mass  = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass)  / 100

Average atomic mass  = (19.9×10.0129371 )+(80.1×11.0093055) /100

Average atomic mass =  199.3 + 881.8 / 100

Average atomic mass = 1081.1  / 100

Average atomic mass  = 10.8  amu.

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).

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