Calculate the average atomic mass of element X. X-204 has an abundance of 1.4% and a mass of 203.973 amu. X-206 has an abundance of 24.1% and a mass of 205.974 amu. X-207 has an abundance of 22.1% and a mass of 206.976 amu. X-208 has an abundance of 52.4% and a mass of 207.977 amu. Can someone please help me i been stuck on this for almost a 30 minutes

The crust of earth may a- continets and ocean floors. b-continents only. c-layers of sedimentary rocks and continents. d-all of the above

What is the percentage of hydrogen in nitrogen trihydride

Two metal blocks that have slightly different temperatures are placed next to one another. after five minutes, they both have lower but equal temperatures. according to the law of conservation of energy, what  most likelyhappened? energy was created inside the blocks.energy was destroyed inside the blocks.energy was absorbed into the blocks from outside the system.energy was transferred from the warmer block to the cooler block.