What is the average atomic mass of silicon given the following abundance information on the isotopes of silicon? [Si-28 (mass 28 amu) has an abundance of 92.21%]
[Si-29 (mass 29 amu) has an abundance of 4.70%]
[Si-30 (mass 30 amu) has an abundance of 3.09%]

How have the greenhouse gasses increased from the year 2000 to 2018

Which of the following is most likely true about water in chemical solutions?

In a heat engine of 1000 j of heat enters the system and the piston does 500 j of work what is the final internal energy of the system if the inital energy was 2000 j we have to do all of these down here 1)write the equation 2)list out your know variables 3)plug the numbers into the equations 4)solve 5)write your solution statemtn that includes inital energuy and final energuy added