Does someone know how to answer this question?

  1. What mass of sodium oxide will be formed
    by burning 20 g of sodium in air?

1 Answer
Feb 3, 2018

The answer to your first question is yes....

Explanation:

As to the answer, we write the stoichiometric equation to inform our arithmetic.....

#2Na(s) + 1/2O_2(g) rarr Na_2O(s)#

This is a redox equation for which BOTH charge and mass are balanced....

And so we find the moles of sodium metal....

#"moles"_(Na)=(20*g)/(22.99*g*mol^-1)=0.870*mol#...

And given the stoichiometry of the reaction (what do I mean by this?), there is half an equiv of dioxygen gas....i.e. a mass of....

#0.870*molxx1/2xx32.00*g*mol^-1~=14*g#

And thus we get mass of approx. #34*g# with respect to #Na_2O#...