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A tank contains a mixture of helium, neon, and argon gases.  If the total pressure in the tank is 490 mmHg and the partial pressures of helium and argon are 215 mmHg and 0.134 atm, respectively, what is the partial pressure of neon?

How many kcal are produced when 32.0 CH4 g reacts in the reaction shown below? CH4 (g) + 2 O2 (g) –> 2 H2O (g) + 218 kcal

The molar mass of calcium hydroxide Ca(OH)2, is

In the following reaction, when the equation is correctly balanced, what is the correct coefficient for aluminum chloride? Al (s) + Cl2 (g) –> AlCl3 (s)

How many grams of hydrogen are needed to produce 1.80 g of water according to this equation? 2 H2 (g) + O2 (g) –> 2 H2O (l)

When 85.0 g of CH4 are mixed with 160.g of O2, the limiting reactant is CH4 (g) + 2 O2 (g) –> CO2 (g) + 2 H2O (g)

Which element has the electron configuration 1s22s22p63s23p2?

Ionization energy is 

The number of electrons in the outer energy level (ie., number of valence electrons) of a neutral atom of boron (atomic number 5) is:

EXTRA CREDIT The following electron configurations contain a coded word. [Xe] 6s² 1s²2s²2p63s1 [Ne] 3s1 1s²2s²2p63s23p4 The coded word is (use all lowercase letters)