Equal volumes of oxygen and an unknown gas weigh 3.00g and 7.50g, respectively. Which of the following is the unknown gas?

3 3 3g mol 22.4L 32 32 x 1 3 3 7.5 22.4L 22.4 32 MW 32 7.5 MW 32 2.5 3 80g mol SO x x x x Ideal gas equation and its applications