<u>The addtion of energy</u> <span>is usually needed to help a decomposition reaction occur</span>
The unknown material : gold
<h3>Further explanation </h3>
Density is a quantity derived from the mass and volume
Density is the ratio of mass per unit volume
Density formula:
ρ = density
m = mass
v = volume
mass of unknown material : 15.06 g
volume : 0.78 ml
The density of unknown material :
Materials that match the density: gold
You have 1 mol of silicon atoms. Therefore you have its atomic mass in grams. The answer is 28.055 g of silicon.
