What is the mass of 7.00 mol of hydrogen peroxide (H_2O_2)?

• A. 0.206 g
• B. 238 g
• C. 126 g
• D. 0.389 g

Answer: (C)

Verified step by step guidance

1. Identify the molar mass of hydrogen peroxide (H\_2O\_2) by summing the atomic masses of its constituent atoms: 2 hydrogen atoms and 2 oxygen atoms.
2. Use the atomic masses from the periodic table: hydrogen (H) is approximately 1.008 g/mol and oxygen (O) is approximately 16.00 g/mol.
3. Calculate the molar mass of H\_2O\_2 using the formula: \(\text{Molar mass} = 2 \times 1.008 + 2 \times 16.00\) g/mol.
4. Multiply the number of moles given (7.00 mol) by the molar mass of H\_2O\_2 to find the total mass: \(\text{Mass} = \text{moles} \times \text{molar mass}\).
5. Express the final answer in grams, which will give you the mass of 7.00 mol of hydrogen peroxide.