Calculate the concentration of nitric acid in moles per litre in a sample which has a density `1.41 g //mL` and the mass percent of nitric acid in it being `69%`.

Explanation

To calculate the concentration of nitric acid (HNO3) in moles per liter (molarity), we will follow these steps:

### Step 1: Determine the mass of nitric acid in the solution
Given that the mass percent of nitric acid in the solution is 69%, this means that in 100 grams of the solution, there are 69 grams of HNO3.

### Step 2: Calculate the total mass of the solution
Since the mass percent is given, we can assume we have 100 grams of the solution. Therefore, the mass of the solution is:
- Mass of solution = 100 grams
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