How many molecules are there in 122 grams of cu(no3)2

 molecules of

Explanation:

According to avogadro's law, 1 mole of every substance weighs equal to the molecular mass and contains avogadro's number of particles.

To calculate the number of moles, we use the equation:

1 mole of contains=  molecules of

Thus 0.65 moles of contains=  molecules of

Thus there are  molecules of

d) a person who learns about the world by observing it.

explanation:

scientist are people who discover why and how things are done and made in the world.