Law of Conservation of Mass worksheet with reaction examples and fill-in-the-blank questions.

It looks like you've uploaded a worksheet about the Law of Conservation of Mass, which states that mass is neither created nor destroyed in a chemical reaction. The total mass of the reactants must equal the total mass of the products.

Let’s solve the problems step by step, based on what's visible in your image.

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🔹 Reaction #1: Magnesium + Oxygen → Magnesium Oxide

Given:
- Magnesium (Mg) = 48.6 g
- Oxygen (O₂) = 32 g
- Product (Magnesium Oxide, MgO) = 80.6 g

#### Question 1: What is the mass of each reactant individually?
- Mg: 48.6 g
- O₂: 32 g

✔ These are already given.

#### Question 2: What is the mass of the reactants when you add them together?
Add the masses:
> 48.6 g (Mg) + 32 g (O₂) = 80.6 g

So, total mass of reactants = 80.6 g

#### Question 3: What is the mass of the product?
The product (MgO) is given as 80.6 g

#### Question 4: How does this demonstrate the Law of Conservation of Mass?
Because:
> Total mass of reactants (48.6 g + 32 g = 80.6 g)
> = Total mass of product (80.6 g)

✔ This shows that mass is conserved — no mass was lost or gained during the reaction.

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🔹 Part 2: Fill in the missing numbers so that each reaction demonstrates the Law of Conservation of Mass

#### Problem 1: ___ g Mg + 16 g O → 40.3 g MgO

We know:
- Mass of product (MgO) = 40.3 g
- Mass of oxygen (O) = 16 g
- Let mass of Mg = ?

Using conservation of mass:
> Mass of Mg + Mass of O = Mass of MgO
> ? + 16 g = 40.3 g
> ? = 40.3 g – 16 g = 24.3 g

✔ So, 24.3 g Mg + 16 g O → 40.3 g MgO

This balances and satisfies the Law of Conservation of Mass.

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✔ Final Answers:

#### Reaction #1:
1. Mg: 48.6 g, O₂: 32 g
2. Total reactant mass: 80.6 g
3. Product mass: 80.6 g
4. It demonstrates the Law of Conservation of Mass because the total mass of reactants equals the total mass of products.

#### Part 2:
1. 24.3 g Mg + 16 g O → 40.3 g MgO

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Let me know if you'd like help with any other parts or want this explained further!