How many moles of oxygen react with 7.3 mole of iron?
4Fe + 302 → 2Fe2O3

The name of the ion, s2-, is: sulfurous ion sulfide ion sulfur ion sulfate ion

Which of the following are sources of revenue for media companies? a. direct sales to producers b. advertising and subscriptions c. online purchase d. capital investments

Asample of tin (ii) chloride has a mass of 0.49 g. after heating, it has a mass of 0.41 g.  what is the percent by mass of water in the hydrate?   %