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The problem asks to calculate the mass of NaCl in 135 mL of a 0.90% (w/v) NaCl solution. Here's how we can solve this:

### Step-by-step solution:
1. **Understand the meaning of 0.90% (w/v):**
   - This means there are 0.90 grams of NaCl in 100 mL of solution.

2. **Set up a proportion to find the mass of NaCl in 135 mL of solution:**
   - We can use the formula:
     \[
     \text{Mass of NaCl} = \left(\frac{0.90 \, \text{g}}{100 \, \text{mL}}\right) \times 135 \, \text{mL}
     \]

3. **Perform the calculation:**
   \[
   \text{Mass of NaCl} = 0.90 \times \frac{135}{100} = 1.215 \, \text{g}
   \]

4. **Rounding the answer:**
   - Since the data provided has 2 significant digits (0.90%), the answer should also be rounded to **2 significant digits**:
     \[
     \boxed{1.2 \, \text{g}}
     \]

### Final Answer:
The mass of NaCl in 135 mL of this solution is **1.2 g**.

Let me know if you would like further details or have any questions!

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Here are 5 related questions to deepen your understanding:
1. How would the mass of NaCl change if the solution were 1.5% instead of 0.90%?
2. What is the mass of NaCl in 500 mL of this same 0.90% solution?
3. If 2 g of NaCl were dissolved in 150 mL of water, what would the concentration (w/v) be?
4. How can you convert a percentage concentration from (w/v) to molarity if the molar mass of NaCl is 58.44 g/mol?
5. How would the result change if we used 150 mL instead of 135 mL?

**Tip:** Always keep track of significant figures throughout the calculation to ensure precision!

Normal saline, a 0.90% (w/v) solution of salt (NaCl) in water, is often used as an IV carrier fluid in hospitals. Calculate the mass of NaCl in 135 mL of this solution. Be sure your answer has a unit symbol and is rounded to the correct number of significant digits.

Learn how to calculate the mass of NaCl in a 135 mL saline solution, given a 0.90% (w/v) concentration. This problem covers proportional calculations, concentration by weight-to-volume, and handling significant figures.

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