n element has FOUR known isotopes with the following atomic masses and percentage of occurrence: 47.688 amu; 15.778% 44.000 amu; 39.687% 43.557 amu; 24.500% 42.609 amu; 20.035% What is the average atomic mass of this element? Group of answer choices

Which substance—wood or silver—is the better thermal conductor? a thermal conductor is a material that requires very little heat energy to change its temperature. explain your answer.

How does a sample of helium at 15 degree celsius compare to a sample of helium at 215 k? a) the helium at 15 degrees celsius has a higher average kinetic energy that the sample at 215 k. b) the helium at 15 degrees celsius has lower nuclear energy that the sample at 215 k. c) the helium at 15 degrees celsius has slower- moving atoms that the sample at 215 k. d) the helium at 15 degrees celsius has smaller atoms than the sample at 215 k.

Acompound has the molecular formula c3h8. which class of organic compounds does it belong to?