A student has blocks of four different materials of identical mass. The materials are ice, gold, aluminum, and Styrofoam. Which blocks would have the largest volume?

Would it be gold?

Also this other question:

What is the total number of atoms in a single unit of the compound Ga(OH)^3?

Thank you very much for all of your help;-)

1 answer

The idea in the first question is to reason through it. What do we know about mass, volume, density? Since mass = volume x density, then
volume = mass/density; therefore, the highest density will be the smallest volume and the lowest density will have the largest volume. right?
The question tells us mass is exactly the same; therefore, the volume MUST depend upon the density.
What do you know about the densities of ice, aluminum, gold, and Styrofoam?

2nd question:
A single unit of Ga(OH)3. That means one molecule. There will 1 Ga atom and 3 O atoms and 3 H atms for a grant total of 1 + 3 + 3 = ??
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