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The problem reads:

"A certain plastic has a density of 1.2 g/cm³. A photo frame is constructed from two sheets of plastic that measure 28 cm by 22 cm by 3.0 mm. What is the mass of the plastic in the photo frame?"

### Let's break this down and solve it step by step:

1. **Dimensions of the plastic sheets**:
   - Length: 28 cm
   - Width: 22 cm
   - Thickness: 3.0 mm = 0.3 cm (since 1 mm = 0.1 cm)

2. **Volume of one plastic sheet**:
   The volume \( V \) of a rectangular sheet can be calculated as:
   \[
   V = \text{length} \times \text{width} \times \text{thickness}
   \]
   For one sheet:
   \[
   V = 28 \, \text{cm} \times 22 \, \text{cm} \times 0.3 \, \text{cm}
   \]
   \[
   V = 184.8 \, \text{cm}^3
   \]

3. **Total volume for two sheets**:
   Since there are two sheets, the total volume is:
   \[
   \text{Total Volume} = 2 \times 184.8 = 369.6 \, \text{cm}^3
   \]

4. **Mass of the plastic**:
   The mass \( m \) can be found using the formula:
   \[
   m = \text{Density} \times \text{Volume}
   \]
   Given that the density is \( 1.2 \, \text{g/cm}^3 \), the mass is:
   \[
   m = 1.2 \times 369.6 = 443.52 \, \text{g}
   \]

### Final Answer:
The mass of the plastic in the photo frame is **443.52 grams**.

Would you like further details on this or have any specific questions?

Here are 5 related questions:
1. What would be the mass if the plastic sheets were thicker, say 4.0 mm?
2. How does changing the density affect the overall mass of the frame?
3. If the frame had three sheets instead of two, how would that affect the mass?
4. What is the difference in mass if the plastic density was 1.5 g/cm³ instead of 1.2 g/cm³?
5. How can you calculate the weight in kilograms?

**Tip**: Always ensure that your units match when performing calculations to avoid errors.

A certain plastic has a density of 1.2 g/cm³. A photo frame is constructed from two sheets of plastic that measure 28 cm by 22 cm by 3.0 mm. What is the mass of the plastic in the photo frame?

Learn how to calculate the mass of plastic sheets used in a photo frame with a density of 1.2 g/cm³. The sheets measure 28 cm by 22 cm by 3.0 mm. This problem covers key concepts like volume, density, and mass calculation. Suitable for Grades 6-9.

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