Many metals react with oxygen gas to form the metal oxide. For example, calcium reacts as follows: 2Ca(s) + O2(g) → 2CaO(s)

Calculate the mass of calcium oxide that can be prepared from 7.52 g of Ca and 5.01 g of O2.

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.

it is a good conductor

explanation:

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.