How many grams of O2 are in a 8.3x10^21 molecules sample? (Two significant figures in your answer and don't forget units)

because u need two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei to form isotopes.

so since they all have the same shape? i mean maybe because m& m and reeses are both chocolates

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.

i think is conclusions.i think so