The molar mass of bismuth (Bi) is 208.98 g/ mol. Calculate the mass in grams of a sample of Bi containing 7.35 x 1023 atoms.
Write your answer using three significant figures. (With explanation please)

Achange in the number of neutrons in an atom will change an blank . when the number of protons changes in an atom, a new element will form.

Liquid ammonia is produced at high temperatures and under great pressure in a tank by passing a mixture of nitrogen gas and hydrogen gas over an iron catalyst. the reaction is represented by the following equation. n2(g) + 3h2(g) → 2nh3(g) changing all but one experimental condition will affect the amount of ammonia produced. that condition is a) increasing the concentration of both reactants b) changing the temperature within the tank c) decreasing the pressure within the tank. d) increasing only the amount of nitrogen present.

Which is an example of a reversible physical change?