Question #19875

1 Answer
Sarah C
May 18, 2017

3.74

Explanation:

It's always a good idea to start with the equation!
Na_2O -> 2Na + ONa2O→2Na+O doesn't quite work because oxygen always exists as a diatomic molecule, so the equation would have to be 2Na_2O -> 4Na + O_22Na2O→4Na+O2.
Now we look at the stoichiometry of the equation - which just means the ratio of different components. These ratios are given by the coefficients - numbers in front of a component.
So here, we can see that for every 2 moles of Sodium Oxide we will get 4 moles of Sodium. So we have a ratio of 2:4 or 1:2.

In the question, there are 1.87 moles of Sodium Oxide so following our ratio there will be 2xx1.87 = 3.742×1.87=3.74 moles

I hope this helps: let me know if I can do anything else:)

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