What is the molar mass of a gas that has a density of 8.12 g/L at 412°C and 0.750 atm?

An unknown compound contains 57.14% carbon, 6.16% hydrogen, 9.52% nitrogen, and the rest oxygen, by mass.  What is the empirical formula of the compound?

What volume of 0.777 M KOH is needed to neutralize 1.56 L of 4.12 M HCl?

Which of the following metals will react with an aqueous iron (II) nitrate solution in a single displacement reaction?

You dilute 215 mL of a 0.361 M sulfuric acid solution to a final volume of 816 mL.  What is the molarity of H+ in the diluted solution?

Write the balanced molecular equations, including states of matter, for each of the following situations if a reaction is expected to occur.  If no reaction occurs, write “NR” (no reaction).   A.   (3 pts)  Aqueous magnesium acetate and aqueous potassium carbonate are combined together. B.   (3 pts)  A gold bar is dropped into a beaker of hydrochloric acid. C.   (3 pts)  Liquid hexane is combusted completely.

What is the symbol of the element below?  Enter the name using correct case (lowercase/uppercase). lead

What is the oxidation number of chromium in the dichromate anion?

What is the systematic name of H2CO3 (aq)?

Which element is a Period 6 transition metal?