Dicium is an element with 2 isotopes. Isotope 1 has a mass of 18.543 amu and an abundance of 22.3%. Isotopes 2 has a mass of 19.621 amu with an abundance of 77.7% what is the average atomic mass dicium

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.

What is the volume of 2.5 moles of nitrogen gas (n2)at standard temperature and pressure (stp)?

Two solids are mixed in a flask and stirred. after a few minutes, the flask becomes cold. which of the following best describes this reaction? a. an exothermic reaction b. a combustion reaction c. an endothermic reaction d. a decomposition reaction