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Let's solve the given problems step by step.

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

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

To find the mass of 1 mole of viruses, we first need to use Avogadro's number, which is \( 6.022 \times 10^{23} \) (the number of particles in a mole).

#### Step 1: Convert the mass of a single virus from milligrams to grams.
\[
9.0 \times 10^{-12} \text{ mg} = 9.0 \times 10^{-15} \text{ g}
\]

#### Step 2: Multiply the mass of a single virus by Avogadro's number to get the mass of 1 mole of viruses.
\[
(9.0 \times 10^{-15} \text{ g}) \times (6.022 \times 10^{23}) = 5.42 \times 10^{9} \text{ g}
\]

So, the mass of 1 mole of viruses is \( 5.4 \times 10^9 \) g (rounded to two significant digits).

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

#### Step 1: Convert the mass of the oil tanker from kilograms to grams.
\[
3.0 \times 10^7 \text{ kg} = 3.0 \times 10^{10} \text{ g}
\]

#### Step 2: Divide the mass of the oil tanker by the mass of 1 mole of viruses.
\[
\frac{3.0 \times 10^{10} \text{ g}}{5.42 \times 10^9 \text{ g}} = 5.54
\]

Rounding to two significant digits, we get \( 5.5 \) moles.

### Summary:
1. The mass of 1 mole of viruses is \( 5.4 \times 10^9 \) g.
2. Approximately \( 5.5 \) moles of viruses have a mass equal to that of the oil tanker.

Would you like more details or have any questions?

### Related Questions:
1. How do you convert units from milligrams to grams?
2. Why do we use Avogadro's number when calculating the mass of a mole of particles?
3. What is the importance of significant figures in scientific calculations?
4. How can we convert between mass and moles for any given substance?
5. What are some real-life applications of Avogadro's number?

### Tip:
Always ensure the units match when performing conversions and calculations involving scientific notation.

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?

Learn how to calculate the mass of 1 mole of viruses using Avogadro's number and convert it to grams. Determine how many moles of viruses are needed to match the mass of an oil tanker, including key scientific notation and unit conversion steps. Suitable for high school students in Grades 10-12.

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