91Ó°ÊÓ

A 4.19-g sample of nitrous oxide (an anesthetic, sometimes called laughing gas) contains \(5.73 \times 10^{22} \mathrm{~N}_{2} \mathrm{O}\)

Nitric acid is composed of \(\mathrm{HNO}_{3}\) molecules. A sample weighing 4.50 g contains \(4.30 \times 10^{22} \mathrm{HNO}_{3}\) molecules. How many nitrogen atoms are in this sample? How many oxygen atoms are in \(61.0 \mathrm{~g}\) of nitric acid?

A sample of ammonia, \(\mathrm{NH}_{3}\), contains \(1.2 \times 10^{23}\) hydrogen atoms. How many \(\mathrm{NH}_{3}\) molecules are in this sample?

A sample of ethanol (ethyl alcohol), \(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH},\) contains \(4.2 \times 10^{23}\) hydrogen atoms. How many \(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}\) molecules are in this sample?

Iron(II) nitrate has the formula \(\mathrm{Fe}\left(\mathrm{NO}_{3}\right)_{2}\). What is the ratio of iron atoms to oxygen atoms in this compound?

Ammonium phosphate, \(\left(\mathrm{NH}_{4}\right)_{3} \mathrm{PO}_{4},\) has how many oxygen atoms for each nitrogen atom?

Write the formula for the compound of each of the following pairs of ions. a.\(\mathrm{Fe}^{3+}\) and \(\mathrm{CN}^{-}\) b.\(\mathrm{K}^{+}\) and \(\mathrm{CO}_{3}^{2-}\) c.\(\mathrm{Li}^{+}\) and \(\mathrm{N}^{3-}\) d.\(\mathrm{Ca}^{2+}\) and \(\mathrm{P}^{3-}\)

For each of the following pairs of ions, write the formula of the corresponding compound. a. \(\mathrm{Co}^{2+}\) and \(\mathrm{N}^{3-}\) b. \(\mathrm{NH}_{4}^{+}\) and \(\mathrm{PO}_{4}^{3-}\) c. \(\mathrm{Na}^{+}\) and \(\mathrm{SO}_{3}^{2-}\) d. \(\mathrm{Fe}^{3+}\) and \(\mathrm{OH}^{-}\) e. \(\mathrm{Fe}^{3+}\) and \(\mathrm{OH}^{-}\)

Name the following compounds. a. \(\mathrm{Na}_{2} \mathrm{SO}_{4}\) b. \(\mathrm{Na}_{3} \mathrm{~N}\) c. \(\mathrm{CuCl}\) d. \(\mathrm{Cr}_{2} \mathrm{O}_{3}\)

Name the following compounds. a. \(\mathrm{CaO}\) b. \(\mathrm{Mn}_{2} \mathrm{O}_{3}\) c. \(\mathrm{NH}_{4} \mathrm{HCO}_{3}\) d. manganese(II) sulfite