CHEM.Final M.6/1

Determine if the following electron configurations are correct 1s2 2s2 2p6 3s2 3p6 4s24d104p6 5s1

Determine if the following electron configurations are correct 1s2 2s2 2p63s3

Determine if the following electron configurations are correct [Rn] 7s25f9 6d2

Determine if the following electron configurations are correct [Ar] 5s2 4d105p5

Determine if the following electron configurations are correct [Xe] 6s2 4f10

How many hydrogen atoms are there in 25.0 g of CH2Cl2?

In which of the following are the name and formula correctly paired?

For which element is the gaining of an electron most exothermic? In summary: most exothermic follows the trend for electron affinity and ionization energy

The species F- , Ne, and Na+ all have the same number of electrons. Which is the predicted order when they are arranged in order of decreasing size (largest first)?

Carbon -14 has a half life of 5730 yrs. How much of a 144 g will remain after 1.719 x 10^4 yrs.?

Iron is a most important metal in our society. How many iron atoms are present in a piece of iron weighing 95.8 g?

How many moles and formulas are in 41.6 g ammonium carbonate?

Which one of the following contains the smallest number of moles of carbon dioxide gas?

Which one of the following samples of gas, when sealed into a vessel of volume 0.10 m3 , is at the highest pressure?

Which one of the following samples of gas occupies the largest volume?

Which one of the following contains the greatest number of moles of methanol? (The Avogadro number (L) is 6.02 × 1023, the relative molecular mass (Mr) of methanol is 32.)

What is the volume occupied by 10.8 g of the freon CCl2F2 at 100 kPa and 273 K?

Calculate the mass percentage of benzene (C6H6) and carbon tetrachloride (CCl4) if 22 g of benzene is dissolved in 122 g of carbon tetrachloride.

Calculate the mole fraction of benzene in solution containing 30% by mass in carbon tetrachloride.

Calculate the mass of urea (NH2CONH2) required in making 2.5 kg of 0.25 molal aqueous solution.