4na +O2 in this chemical reaction how many

The balanced chemical equation representing the reaction of sodium metal with oxygen gas is,

4 Na (s) + O_{2}-->2Na_{2}O(s)

4 mol Na require 1 mol O2 for complete reaction to form 2 mol Na2O

Given the moles of Na reacting = 2.90 mol Na

2 mol Na_{2}O can form from 4 mol Na as per the balanced chemical equation.

Calculating the moles of Na_{2}O that can be formed from 2.90 mol Na:

2.90 mol Na * \frac{2 mol Na_{2}O }{4 mol Na} = 1.45 mol Na_{2}O

Therefore, 1.45 mol Na_{2}O can form from 2.90 mol Na.

Explanation:

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c. is the answer

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