Multiple Choice
A gas has a density of 3.55 g/L at 2.00 atm and 55.0 °C. What is the molar mass of the gas?
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2. Atoms & Elements
Calculating Molar Mass
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
What is the mass of 7.00 mol of hydrogen peroxide (H_2O_2)?
A
49 g
B
392 g
C
112 g
D
238 g
Verified step by step guidance1
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.
Use the atomic masses from the periodic table: approximately 1.01 g/mol for hydrogen and 16.00 g/mol for oxygen.
Calculate the molar mass of H\_2O\_2 using the formula: molar mass = (2 \times atomic mass of H) + (2 \times atomic mass of O).
Multiply the number of moles (7.00 mol) by the molar mass of H\_2O\_2 to find the total mass: mass = moles \times molar mass.
Express the final mass in grams, which will give you the mass of 7.00 mol of hydrogen peroxide.
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