91Ó°ÊÓ

State how many moles are present in the following samples. (a) \(1.33 \times 10^{26}\) molecules of \(\mathrm{Br}_{2}\) (b) \(7.71 \times 10^{26}\) molecules of \(\mathrm{C}_{5} \mathrm{H}_{12}\) (c) \(2.34 \times 10^{23}\) molecules of \(\mathrm{B}_{2} \mathrm{H}_{6}\) (d) \(7.76 \times 10^{23}\) atoms of Ne

Give the molar mass of the following substances. (a) \(\mathrm{Na} \mathrm{OH}\) (b) \(\mathrm{C}_{2} \mathrm{H}_{4}\) (c) \(\mathrm{Mg}(\mathrm{OH})_{2}\)

Give the molar mass of the following substances. (a) \(\mathrm{N}_{2} \mathrm{O}_{4}\) (b) \(\mathrm{Na}_{2} \mathrm{SO}_{4}\) (c) \(\mathrm{C}_{6} \mathrm{H}_{10} \mathrm{O}_{2}\)

Give the molar mass of the following substances. (a) \(\mathrm{ZnBr}_{2}\) (b) \(\mathrm{K}_{2} \mathrm{CrO}_{4}\) (c) \(\mathrm{BaS}\)

Give the molar mass of the following substances. (a) \(\mathrm{N}_{2} \mathrm{O}_{2}\) (b) \(\left(\mathrm{NH}_{4}\right)_{2} \mathrm{CO}_{3}\) (c) \(\mathrm{C}_{8} \mathrm{H}_{15} \mathrm{~N}\)

(a) Calculate the number of moles in \(9.40 \mathrm{~g} \mathrm{SO}_{2}\). (b) Calculate the mass in \(3.30 \mathrm{~mol} \mathrm{AlCl}_{3}\). (c) Calculate the number of moles in \(1.12 \times 10^{23}\) molecules of \(\mathrm{H}_{2} \mathrm{SO}_{4}\)

How many moles of compound are in (a) \(39.2 \mathrm{~g} \mathrm{H}_{2} \mathrm{SO}_{4} ?\) (b) \(8.00 \mathrm{~g} \mathrm{O}_{2}\) ? (c) \(10.7 \mathrm{~g} \mathrm{NH}_{3}\) ?

(a) Calculate the number of moles in \(14.3 \mathrm{~g} \mathrm{C}_{6} \mathrm{H}_{6}\) (b) Calculate the mass of \(0.0535 \mathrm{~mol} \mathrm{SiH}_{4}\). (c) Calculate the number of molecules in \(1.11 \mathrm{~g} \mathrm{H}_{2} \mathrm{O}\).

(a) Calculate the number of moles in \(48.0 \mathrm{~g} \mathrm{H}_{2} \mathrm{O}_{2}\). (b) Calculate the number of oxygen atoms in this sample.

(a) Calculate the number of molecules in \(3.4 \mathrm{~g} \mathrm{H}_{2}\). (b) Calculate the number of hydrogen atoms in this sample.