Because the helium inside it is lighter than air , hence it rises up
The balloon from our breath contains carbon dioxide which is heavier than air so it doesn’t rise

6 0

3 years ago

Green plants use light from the Sun to drive photosynthesis, a chemical reaction in which liquid water and carbon dioxide gas fo

Nastasia [14]

The question is missing the number of moles of carbon dioxide that will react with water.

I will work the problem with an arbitrary amount of carbon dioxide to show how to solve it.

For this, I will take 2.40 moles of carbon dioxide.

Answer:

The number of moles of oxygen atoms produced is equal to the number of moles of carbon dioixide that react: 2.40 moles of oxygen.

2.40 has 3 significant figures.

Explanation:

1) Word equation:

carbon dioxide gas + liquid water (in the presence of light) → aqueous glucose + oxygen gas

2) Balanced chemical equation

6CO₂ (g) + 6H₂O (l) → C₆H₁₂O₆ (aq) + 6O₂(g)

3) Mole ratios

6 mol CO₂ (g) : 6 mol H₂O (l) : 1 mol C₆H₁₂O₆ (aq) : 6 mol O₂(g)

4) Set a proportion:

It is assumed that there is plenty liquid water (excess reactant), so you can set a proportion with the number of moles of carbon dioxide:

6 mol CO₂ / 6 mol O₂ = 2.40 mol CO₂ / x

From which, x = 2.40 mol O₂

So, the number of moles of oxygen produced is equal to the number of moles of carbon dioxide that react.

Since the number of moles of reactant has 3 significant figures, and the stoichiometric coefficients are considered exact, the answer also has 3 significant figures.

5 0

3 years ago