25 mg of sulfuric acid contains how many moles of sulfuric acid? Detailed chemical calculation

In chemistry, it is very important to understand the relationship between molecular weight, molar mass and substance, especially when it comes to the conversion of quantity and mass of substances. Today we will use an example to answer the question "How many moles of sulfuric acid are contained in 25 mg of sulfuric acid?" This question, and through the specific calculation process to help you understand the relevant chemical principles.

1. Mole and mass of the basic concept

We need to understand the concept of "Moore. In chemistry, 1 mole of a substance is a substance that contains 6.022 × 10 ² molecules. This is the number represented by Avogadro's Number. Molar mass refers to the mass of one mole of a substance, typically in grams per mole (g/mol).

When solving the problem of "how many moles of sulfuric acid are contained in 25 milligrams of sulfuric acid", we need to use the molar mass of sulfuric acid to perform unit conversion and calculation.

2. Calculation of sulfuric acid molar mass

The chemical formula of sulfuric acid is H₂ SO, which is composed of three elements: hydrogen (H), sulfur (S) and oxygen (O). We can calculate the molar mass of sulfuric acid based on the relative atomic mass of each element.

• Hydrogen (H) has a relative atomic mass of 1.008g/mol.
• Sulfur (S) has a relative atomic mass of 32.06g/mol.
• Oxygen (O) has a relative atomic mass of 16.00g/mol.

Therefore, the molar mass of sulfuric acid (H₂ SOHH) is calculated as follows:

[ \text {molar mass} = (2 \times 1.008) 32.06 (4 \times 16.00) = 98.08 \, \text{g/mol} ]

the molar mass of sulfuric acid is therefore 98.08g/mol.

3. 25 mg sulfuric acid mass unit conversion

Given in the title is 25 milligrams (mg) of sulfuric acid, we need to convert it to grams (g), because the unit of molar mass is grams per mole (g/mol).

[ 25 \, \text{mg} = 25 \div 1000=0.025 \, \text{g} ]

therefore, the mass of 25 mg of sulfuric acid is 0.025 grams.

4. Calculate the number of moles of sulfuric acid

According to the molar mass formula:

[ \text {moles} = \frac{\text {mass }}{\ text {molar mass}} ]

substituting Known Data:

[ \text {moles} = \frac{0.025 \, \text{g }}{ 98.08 \, \text{g/mol}} = 2.55 \times 10 ^{-4} \, \text{mol} ]

thus, 25 mg of sulfuric acid contains approximately (2.55 \times 10 ^{-4}) moles of sulfuric acid.

5. Conclusion: 25 mg of sulfuric acid contains how many moles of sulfuric acid?

In summary, it is calculated that 25 mg of sulfuric acid contains approximately (2.55 \times 10 ^{-4}) moles of sulfuric acid. This process involves the conversion between mass and molar mass, and how to calculate the number of moles of a substance from the mass.

If you are still confused by the question "How many moles of sulfuric acid are contained in 25 mg of sulfuric acid?", I hope that through this detailed analysis, you can better understand the relevant calculation methods in chemistry.