21. At n.u. 0.2 l of a certain gas has a mass of 0.328 g, and the mass of 0.5 l of hydrogen under the same conditions is 0.045 g. Calculate the molecular mass of that gas based on: a) its density with respect to hydrogen; b) its molar volume.

If you cannot open the file or have any problems, do not rush to leave a negative review! Contact me and I will quickly help you solve the problem. After purchasing, please leave a positive review of the product :)