a gaseous compound is 30.4% nitrogen and 69.6% oxygen by mass. a 5.25 g sample of the gas occupies a volume of 1.00L and exerts a pressure of 1.26atm at -4.0C. how many atoms are there in 1 molecule of this chemical?

Question

anonymous · Answer

My computer keeps freezing, super annoying. Ok assume your percents are grams. Find the moles of each. Divide by the smaller number. You get 1 for nitrogen and 2 for oxygen. We know that there are 2moles of oxygen for every one nitrogen so your compound's empirical formula is NO2. Then use PV=nRT except rearranged to solve for molar mass.$$molar\ mass = {gRT \over PV}$$ Since now you have molar mass and the empirical formula you can find it's molecular formula.. Then use avogadro's number and multiply by the total amount of moles in it's moleculat formula. For instance NO2 would be 3 CH3 would be 4 Al2O3 would be 5.