Consider equimolar samples of different ideal gases at the same volume and temperature. gas a has a higher molar mass than gas b

Given: 2H2O2 → 2H2O + O2 structure of H2O2: H-O-O-H Bond Bond Energy (kJ/mol) O-H 459 O=O 494 O-O 142 Based on the given bond energies, what is the enthalpy change for the chemical reaction? A. - 352 kJ B. - 210 kJ C. - 176 kJ D. - 105 kJ

Calculate the number of moles in 3.025 X 10^28 atoms of NaCl. 1.0 mol NaCl 5.02 X 10^4 mol NaCl 5.02 X 10^50 mol NaCl 1.78 X 10^39 mol NaCl

3. Which statement describes the charge and location of an electron in an atom? A) An electron has a positive charge and is located outside the nucleus. B) An electron has a positive charge and is located in the nucleus.

A certain organ pipe, open at both ends, produces a fundamental frequency of 272 HzHz in air. Part A If the pipe is filled with helium at the same temperature, what fundamental frequency fHefHef_He will it produce?

Which statement best explains the octet rule? A) atoms gain, lose, or share electrons at achieve a full valence shell B) compounds always consist of 8 shell C) molecules always of 8 atoms D) all atoms require of 8 electrons to from bonds

A solution contains. 36 g sodium hydroxide in 500 ml what is the ph

Extra Stoichiometry Practice 1. How many grams of aluminum oxide can be formed by the reaction of 38.8 g of aluminum with oxygen? 4 Al (8) + 3 O2 (g) →2 A12O (s)

Calculate the pH of a solution in which [H3O+]=9.5*10-9M. Express the pH of the solution to two decimal places.

1. The simulation shows a quantity of oxygen molecules. What state of matter is this?

Whereas asteroids are compromised primarily of (Blank), comets are compromised primarily of. A. Rocky material; icy material B. permafrost; molten rock C. icy material; rocky material D. Dark cloud; planetary fragmetns