It is known that the density of iron is higher than that of aluminum, which indicates that the mass of iron and aluminum with equal volume is larger, and the volume of iron and aluminum with equal mass is larger

It is known that the density of iron is higher than that of aluminum, which indicates that the mass of iron and aluminum with equal volume is larger, and the volume of iron and aluminum with equal mass is larger

One empty: m al = V al * P al
M iron = V iron * P iron
It is known that V Cu = V Fe, P Al is less than p Fe, so m Al is less than m Fe
Two empty: m al = m Fe, P Al is less than p Fe, so V Al is larger than V Fe

It is known that the volume and mass of the three substances are equal respectively. The density of iron is greater than that of copper and that of lead. What is the conclusion

According to the density = mass / volume, it can be seen that the volume of iron is less than that of copper and less than that of lead, so it can be seen that iron is hollow and has the largest internal space; copper is hollow and its internal space is less than that of iron; copper may be hollow or solid
The so-called volume equality is only the visual equality, not the real volume equality
That's it! Please mark!

Density of aluminum, iron and lead

5 600 kg / m3 of iron
2700kg / m3 of aluminum
10700 of lead

Does the molar mass have to be equal to the density?

Is not the molar mass of (symbol: m) numerically equal to its formula
Density is the ratio of mass to volume
The quantity of matter (symbol: n) is equal to the ratio of its mass to the quantity of matter