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The given problem is asking to find the total mass of 15 particles, where the mass of each particle is \( 0.26 \times 10^{-25} \) grams.

### Step-by-step solution:

1. **Mass of one particle**: \( 0.26 \times 10^{-25} \, g \)
2. **Total mass of 15 particles**: We multiply the mass of one particle by 15.
   
   \[
   \text{Total mass} = 15 \times (0.26 \times 10^{-25}) = (15 \times 0.26) \times 10^{-25}
   \]
   
   \[
   15 \times 0.26 = 3.9
   \]

   So,
   \[
   \text{Total mass} = 3.9 \times 10^{-25} \, g
   \]

### Conclusion:
The correct answer is **A. \( 3.9 \times 10^{-25} \, g \)**.

Let me know if you need any further details!

### Related Questions:
1. How would the total mass change if there were 20 particles instead of 15?
2. What would be the mass of 1 particle if it was multiplied by \( 10^{-24} \) instead of \( 10^{-25} \)?
3. How does multiplying a number by powers of 10 affect the overall value?
4. Can you express the mass in standard notation instead of scientific notation?
5. If the mass of one particle were \( 0.13 \times 10^{-25} \, g \), what would the total mass of 15 particles be?

**Tip:** When dealing with scientific notation, focus on multiplying the numerical coefficients first before adjusting the powers of 10.

The mass of a particle is 0.26 × 10^-25 g. Find the total mass, in g, of 15 particles.

Learn how to find the total mass of 15 particles, each with a mass of 0.26 × 10^-25 g, using multiplication and scientific notation. This step-by-step solution covers key concepts of powers of 10 and rules of exponents. Suitable for Grades 6-8.

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