Balance the following chemical equation:          Fe2O3 (s)   +          C (s)    →           Fe (s)  +         CO2 (g) What is the correct coefficient for iron?

How many moles of oxygen are in 3.0 moles of aluminum perchlorate, Al(ClO4)3?

Which of the following is best classified as a decomposition reaction?

Calculate the percentage by mass (in %) of hydrogen in cisplatin, PtCl2(NH3)2.

Consider the reaction of nitrogen, N2, with hydrogen, H2: N2 (g) + 3 H2 (g) → 2 NH3 (g) What is the percent yield of NH3 when 15.0 g of N2 reacts with an excess of H2 to produce 15.4 grams of NH3?  

The combustion of propane (C3H8) in the presence of oxygen yields the following reaction: C3H8 (g) + 5 O2 (g) → 3 CO2 (g) + 4 H2O (g) What mass of CO2 (in g) can be produced when 5.00 moles of propane reacts with 2.00 moles of oxygen?

A sample of pure gold contains 2.89 x 1023 atoms of gold. What is the mass (in g) of this sample of gold?  

How many moles of oxygen are in 3.0 moles of barium perchlorate, Ba(ClO4)2?

A sample of pure silver contains 2.89 x 1023 atoms of silver. What is the mass (in g) of this sample of silver?

Which of the following is best classified as a acid-base neutralization reaction?