An unknown element is a mixture of isotopes ¹²⁰X and ¹²²X. The average atomic mass of X is 120.26 amu. What is the percent abundance of ¹²²X?

Percent abundance of ¹²²X is 13%

Explanation:

The ¹²⁰X has a mass of 120 amu and ¹²²X has a mass of 122 amu. The average atomic mass is:

Average: 120.26amu: X*120amu + Y*122amu (1)

Where X is percent abundance of ¹²⁰X and Y percent abundance of ¹²²X

That means you can also write:

X + Y = 1 (2)

Because the sum of both percentages is 100%

Replacing (2) in (1):

120(1-Y) + 122Y = 120.26

120 - 120Y + 122Y = 120.26

2Y = 0.26

Y = 0.13 = 13%

That means percent abundance of ¹²²X is 13%

Ithink this is what you meant. the temperature at which a liquid begins to boil is called the boiling point. the boiling point of water is 212°f or 100°c.  and at that point will start to turn into steam (gas)

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