For hydrogen peroxide (H_2O_2), What is the molecular mass number How many moles
ID: 1416837 • Letter: F
Question
For hydrogen peroxide (H_2O_2), What is the molecular mass number How many moles of hydrogen peroxide molecules are in 100 g of hydrogen peroxide? How many atoms of hydrogen are in 100 g of hydrogen peroxide? The length of a steel beam (a_steel = 12 times 10^-6) increases by 0.73 mm when its temperature is raised from 22degree C to 35degreeC. What is the length of the beam at 22degreeC? Total lung capacity of a typical adult is approximately 5.0 L. Approximately 20% of the air is oxygen. At sea level and at an average body temperature of 37degreeC, how many moles of oxygen do the lungs contain at the end of an inhalation? Use the ideal gas law A gas in a container consists of a mixture of neon and argon. The average speed of the neon atoms is 400 m/s. What is the mass of a single atom of neon, in kilograms? What is the average kinetic energy of the neon atoms, in Joules? What is the mass of a single atom of argon, in kilograms? Recognizing that the neon and argon molecules have the same average kinetic energy, what is the average speed of the argon atoms, in meters per second?Explanation / Answer
1. (A) H = 1.00794
O = 15.9994
so H2O2 = 34.0147 g/mol
(B) mol = 100 g / 34.0147 g/mol
= 2.940 mol
(C) no of H atoms = 100g x (1 mole H2O2 / 34.0147 g H2O2) x (6.022x10^23 molecules H2O2 / mole H2O2) x (2 atoms H / 1 molecule H2O2)
= 3.54 x10^24 atoms of H
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