Chemistry Question on Stoichiometry and Stoichiometric Calculations

Question

The molecular weight of $O_2$ and $SO_2$ are 32 and 64 respectively. At $15^{\circ}C$ and 150 mmHg pressure, 1L of $O_2$ contains -N - molecules. The number of molecules in 2L of $SO_2$ under the same conditions of temperature and pressure will be

Answer 1

Solution

According to Avogadro's law "equal volumes of all gases contain equal number of molecules under similar conditions of temperature and pressure.
Thus, if 1 L of one gas contains N molecules, 2 L of any gas under similar conditions will contain 2 N molecules.