The average mass of all the isotopes of an element is called the . will mark brainlest for the best answer.

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How many moles of gas are present if p=11 atm, v=12l, t=185k?

Melting and boiling are endothermic processes. this means that these processes absorb energy from their surroundings in order to occur. use this information and the data you collected in the phase change gizmo to describe what happens to the temperature of water when you boil it, then explain why this result occurs.

Chen drew a diagram to compare the ways in which different organisms obtain nitrogen. which label belongs to the area marked z?