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Let's solve these two problems step-by-step. 

### Given:
1. **Mass of a virus**: \(9.0 \times 10^{-12} \, \text{mg}\)
2. **Mass of an oil tanker**: \(3.0 \times 10^7 \, \text{kg}\)

### 1. What is the mass of 1 mole of viruses?

To find the mass of 1 mole of viruses, we need to multiply the mass of a single virus by Avogadro's number (\(6.022 \times 10^{23}\)).

1. **Convert mass of virus from milligrams to grams**:  
   \(9.0 \times 10^{-12} \, \text{mg} = 9.0 \times 10^{-15} \, \text{g}\)

2. **Calculate mass of 1 mole of viruses**:  
   \[
   \text{Mass of 1 mole of viruses} = 9.0 \times 10^{-15} \, \text{g} \times 6.022 \times 10^{23}
   \]
   Let's compute this.

### 2. How many moles of viruses have a mass equal to the mass of an oil tanker?

To find the number of moles of viruses that would have a mass equal to the mass of an oil tanker, we divide the mass of the oil tanker by the mass of 1 mole of viruses.

1. **Convert the mass of the oil tanker from kilograms to grams**:  
   \(3.0 \times 10^7 \, \text{kg} = 3.0 \times 10^{10} \, \text{g}\)

2. **Calculate number of moles**:  
   \[
   \text{Number of moles} = \frac{\text{Mass of oil tanker in grams}}{\text{Mass of 1 mole of viruses}}
   \]

Let's compute these values.### Solutions:

1. **Mass of 1 mole of viruses**:  
   The mass of 1 mole of viruses is approximately \(5.4 \times 10^9 \, \text{g}\) (or \(5.4 \times 10^{12} \, \text{mg}\)).

2. **Number of moles of viruses that have a mass equal to the mass of an oil tanker**:  
   The number of moles of viruses that would have a mass equal to the mass of an oil tanker is approximately \(5.6 \times 10^{-3}\) moles.

If you have any questions or need further details, please let me know!

### Relative Questions:
1. How is Avogadro's number used in calculating the mass of a mole?
2. Why is it important to convert units when solving such problems?
3. How would the mass change if the virus mass were given in nanograms instead of milligrams?
4. What is the significance of significant digits in scientific calculations?
5. How would you solve this problem if the mass of the oil tanker were given in pounds?

### Tip:
Always ensure your units are consistent when performing calculations in physics or chemistry to avoid errors.

A virus has a mass of 9.0 × 10^-12 mg and an oil tanker has a mass of 3.0 × 10^7 kg. What is the mass of 1 mole of viruses? How many moles of viruses have a mass equal to the mass of an oil tanker?

Solve a problem involving scientific notation and unit conversions to find the mass of 1 mole of viruses and determine the number of moles equivalent to the mass of an oil tanker. Perfect for high school students studying chemistry.

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