Full worked out solutions to the problems below with explanations available with 🔐 CHEMDUNN access
Write the orbital diagram for the following species and determine the number of unpaired electrons.
(a) O (b) Al3+
Write the electron configuration for Ge. Identify the valence electrons and the core electrons.
Magnesium has three naturally occurring isotopes with masses of 23.99 amu, 24.99 amu, and 25.98 amu and natural abundances of 78.99%, 10.00% and 11.01%, respectively. Calculate the atomic mass of magnesium.
A laboratory analysis of a common over-the-counter (OTC) medication determined the following mass percent composition by mass spectroscopy:
C 60.00%
H 4.48%
O 35.52%
Find the empirical formula.
A compound containing nitrogen and oxygen is decomposed in the laboratory and produces 24.5 g nitrogen and 70.0 g oxygen. Calculate the empirical formula of a compound.
BONUS QUESTION/FOLLOW UP
(Complete after you get your answer above)
Is this compound Dinitrogen pentoxide?
Butanedione—a main component responsible for the smell and taste of butter and cheese—contains the elements carbon, hydrogen, and oxygen. The empirical formula of butanedione is C2H3O, and its molar mass if 86.09 g/mol. Find its molecular formula.
Upon combustion, a 0.8233 g sample of a compound containing only carbon, hydrogen, and oxygen produces 2.445 g CO2 and 0.6003 g H2O. Find the empirical formula of the compound.
The combustion of an unknown organic compound (which only contains carbon, hydrogen and nitrogen) yields 12.923 g of carbon dioxide and 6.608 g of water. Treatment of the nitrogen with hydrogen gas results in 2.501 g ammonia, NH3. The complete combustion of 11.014 g of this unknown organic compound needs 10.573 g of oxygen gas. Determine the empirical formula.
A 15.67 g sample of a hydrate of magnesium carbonate was heated, without decomposing the carbonate, to drive off the water. The mass was reduced to 7.58 g. What is the formula of the hydrate?