Four nails have a total mass of 5.42 grams. How many
moles of iron atoms do they contain?

Can someone me with 3 and 4 plz. this is for masteries test.

How is the shape of the poem “peer” connected to its meaning?

Alidded glass container is filled with a colored gas. after a period of time, it is observed that the gas is uniformly spread throughout the box and that the movement has slowed considerably. next, a warm iron plate is carefully placed under the box. why is there resumed movement of the gas in the container?