2.0 grams of Zn reacts with excess oxygen to produce ZnO. What is the mass of ZnO produced?2019 Atomi QuestionA(Choice A)

To solve this problem, we need to use stoichiometry, which is a section of chemistry that involves using relationships between reactants and/or products in a chemical reaction to determine desired quantitative data.

Here are the steps:

1. Write down the balanced chemical equation for the reaction. The reaction of zinc with oxygen to form zinc oxide is represented as follows: 2Zn + O2 → 2ZnO

2. From the balanced equation, we can see that the molar ratio of Zn to ZnO is 1:1. This means that 1 mole of Zn produces 1 mole of ZnO.

3. Convert the given mass of Zn (2.0 grams) to moles. The molar mass of Zn is about 65.38 g/mol. So, the number of moles of Zn is 2.0 g / 65.38 g/mol = 0.0306 mol.

4. Since the molar ratio of Zn to ZnO is 1:1, the moles of ZnO produced will also be 0.0306 mol.

5. Convert the moles of ZnO to grams. The molar mass of ZnO is about 81.38 g/mol. So, the mass of ZnO produced is 0.0306 mol * 81.38 g/mol = 2.49 g.

So, the mass of ZnO produced when 2.0 grams of Zn reacts with excess oxygen is approximately 2.49 grams.