A sample of an unknown gas effuses in 12.1 min. an equal volume of h2 in the same apparatus under the same conditions effuses in 2.42 min. what is the molar mass of the unknown gas?

How does the number of molecules in 1 mol of oxygen compare with the number of molecules in 1 mol of nitrogen? A. 1 mol of oxygen has fewer molecules. B. 1 mol of oxygen has more molecules. C. Each sample has the same number of molecules. D.

What volume of propane (C3H8) is required to produce 165 liters of water according to the following reaction? (All gases are at the same temperature and pressure.) propane (C3H8) (g) + oxygen (g) carbon dioxide (g) + water (g)

One similarity and one difference between an element and a mixture of elements

What would the Net Ionic Equation be for the following: NH3 (aq) + HC2H3O2 (aq) NaOH (aq) + H2SO4 (aq) H2S (aq) + Ba (OH) 2 (aq)

Atom tableTomic number mass number number of protons number of neutrons number of electrons symbol

Great white sharks live in the waters around California and feed on seals. Changes in his ecosystem have caused the seal population to decrease. Which result is an adaptation by sharks when there are fewer seals to eat? A.

Which of the following changes occurs with the greatest increase in entropy?

A child sits on a partially filled balloon and decreases the volume by half. What happens to the pressure inside of the balloon?

Which phrases describe all the outer planets' motion? Check all that apply. no rotation fast rotation slow revolution opposite revolution north to south rotation

Rank the species (amide ion, ammonia, or ammonium ion) from the largest to the smallest H-N-HH-N-H bond angle? Rank from largest to smallest H-N-HH-N-H bond angle. To rank items as equivalent, overlap them.