# Calculate the mass of sodium oxide that forms when 20 grams of sodium reacts with oxygen.

June 29, 2021 | education

| m (Na) = 20 g.

Determine the mass of sodium oxide. We write down the resulting solution.

First, we write down the equation of reactions.

2Na + O2 = 2Na2O

First, we calculate the molar mass of sodium and sodium oxide. We get the following.

M (Na) = 23 g / mol.

M (Na2O) = 2 * 23 + 16 = 46 + 16 = 62 g / mol.

Further, according to the reaction equation, we find the mass of sodium oxide. We get the following.

20 g sodium – x g sodium oxide

2 * 23 g / mol sodium – 2 * 62 g / mol sodium oxide

Find the unknown value of x.

X = 20 * 2 * 62: (23 * 2) = 54 g Na2O.

The result is a mass of sodium oxide equal to 54 grams.

Answer: m (Na2O) = 54 g.

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