STEP I : BALANCED EQUATION AND MOLES OF Na
2Na(s) + O2(g) 2Na2O(s)
Moles of Na in 15.0g
STEP II : MOLES AND MASS OF O2
From the equation, mole ratio of Na:O2 = 1:1
Moles of oxygen
Mass of oxygen = Moles x Molar Mass
= 0.326mol x 16g/mol
= 5.22g
Mass of oxygen
Comments
Leave a comment