Question

How many grams of Na2O are produced when 28.5 g of Na reacts?Sodium reacts with oxygen to produce sodium oxide.4Na(s)+O2(g)→2Na2O(s)

Answer 1

Step 1

The equation provided:

4 Na (s) + O2 (g) → 2 Na2O (s) (completed and balanced)

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Step 2

Information provided:

28.5 g of Na

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Information needed:

The molar masses of:

Na2O = 61.9 g/mol

Na = 23.0 g/mol

(The periodic table is useful here)

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Step 3

Procedure:

By stoichiometry,

4 Na (s) + O2 (g) → 2 Na2O (s)

4 x 23.0 g Na -------------- 2 x 61.9 g Na2O (given by the reaction)

28.5 g Na -------------- X

X = (28.5 g Na x 2 x 61.9 g Na2O)/4 x 23.0 g Na

X = 38.4 g

Answer: 38.4 g of Na2O produced