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?

The atomic mass is important because A. it tells the size of the atom. B. it tells you the charge of the atom . C. it tells you the number of electrons.

16. Which element has th17. Magnesium, Mg, tends to form a + 2 ion. Which will have the larger atomic radius? Mg or Mg2 + (Explain why) e greater electronegativity: fluorine or lithium? What does this mean?

What is the difference between o2 and f2

An unsaturated aqueous solution of NH3 is at 90.°C in 100. grams of water. According to Reference Table G, how many grams of NH3 could this unsaturated solution contain? (1) 5 g (3) 15 g (2) 10. g (4) 20. g

Determine the frequency of light with a ... of light with a wavelength of 4.257 x 10^-7 cm

How many moles of h2so4 are required to react with 6.80 miles of al2o3

Which explanation best describes a wave? A. a disturbance that travels through a medium with a transfer of energy and matter B. a disturbance that travels through a medium without a transfer of energy and matter C.

The requirements for one type of atom to substitute for another in a solid solution are:

How could you separate items that are different densities? explain

Why do elements within a period of the periodic table have different properties