What is the theoretical yield of Fe2O3 (molar mass: 159.7 g/mol) when 60.0 g of Fe (molar mass: 55.85 g/mol) reacts with excess amount of O2? 4 Fe (s)  +  3 O2 (g)  –> 2 Fe2O3 (s)

What is the oxidation number of sulfur (S) atom in the following compound, Na2S2O3?

How many carbon atoms are found in 10.0 g of C2H6 (molar mass: 30.07 g/mol)?

Which of the following is the correct Lewis structure of HCN?

Which of the following are isotopes of the same element? Note that the letter Z does NOT represent the element symbol. I. II. III.

A local FM radio station broadcasts at a frequency of 92.8 MHz. What is the wavelength (in m) of its radio signal?

What is the effective nuclear charge felt by the valence electrons of a silicon (Si) atom?

What is the molecular geometry of BrF3?

What is the formal charge on the N atom in the following Lewis structure?  

Silicon carbide (SiC) is an important ceramic material that can be made according to the following reaction: SiO2 (s)  +  3 C (s)