Acertain element x has four isotopes. 94.93% of x has a mass of 31.97207 amu . 0.7640% of x has a mass of 32.97146 amu . 4.290% of x has a mass of 33.96786 amu . 1.600×10−2% of x has a mass of 35.96709 amu . what is the average atomic mass of element x ?

Average atomic mass is the weighted average atomic mass of an element with regard to the abundance of all its isotopes.
average atomic mass of X can be calculates as follows;
average atomic mass of X = sum of the products of mass of isotopes by their abundance percentages
average atomic mass of X = (94.93 % x 31.97207 amu) + (0.7640% x 32.97146 amu) + (4.290% x 33.96786 amu) + (1.600×10−2% x 35.96709 amu) 

average atomic mass of X = 30.35 + 0.2519 + 1.457 + 0.005755
therefore average atomic mass of X = 32.06 

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Firstly, the water in the dams hold gravitational potential energy as they are above ground level. the gravitational potential energy is then transferred to kinetic energy as it falls, spinning the turbinethe turbine then spins the generator, which is a large magnet surrounded by metal coils. by doing this, the generator generates electricity. in this action, the energy transfer taken place is kinetic to electric energy