Calculate each of the following quantities for an ideal gas?

Calculate each of the following quantities.?

• Answer:

  (a) To get the number of moles, divide by Avogadro's number, 6.022×10^23 mol-1. Multiply the molar mass of NO2 times the number of moles of NO2. This will give an answer in grams, but since you need kilograms, multiply by the correct conversion factor (1kg/1000 g). Done in one step, this would look like the following: (2.6 * 10^20 molecules NO2/6.022×10^23 mol-1)(1 mol NO2/46.01 g mol-1)(1kg/1000 g) = 9.38 * 10^-9 kg (b) (molar mass of C2H4Cl2)(grams C2H4Cl2) gives the moles of C2H4Cl2. Since two chlorine atoms are present in each molecule of the compound, you then need to multiply by two. (c) Follow the same tactic as in (b), noticing the number of hydrogen atoms in each molecule of SrH2. After finding the number of moles, multiply by Avogadro's number, which I posted above, to obtain the total number of molecules.