A compound, Na2Cr2Ox, where x is unknown, is analyzed and found to contain 39.70% Cr. What is the value of x?

Video transcript

Hey everyone. So you were asked to identify the value of X. In the compound K. Three B. O. X. Given that it is composed of 14.59% phosphorus by mass from a mass percent. Given we can find a total mass of the compound. Use of phosphorus atomic mass. Recall that mass percent. It was the mass of the element by by the mask of the compound Times 100 Healthy. Plug in the virus. You're gonna get 14 .59%. It goes 30.974 grams caramel. Good bye bye. X. Times 100%. We're gonna get 14.59 times X. It goes 30 .974 grams per mole Times 100%. We're gonna divide both sides. 14.59%. You get X. It was 212 0.30 grams per mole, which is the mass of the compound. So now we can set up the equation algebraic lee to find the number of oxygen in the molecule. You have three Times 39. brands promote plus .974 transfer mall first eggs, 15.999 grounds promote. I'm gonna get 212 0.30 Dance promote. We have a 148 .268 grams per mole plus .999 ground ball times It was 212 0.30. We asked for a mold Used to track .268 brands promote from both sides. We're gonna get 15 .999 grams per mole times X. People, 64 .032 fans promote to solve for X. We're gonna divide both sides 15. grounds for mold eggs. It's gonna be four. Thanks for watching my video, and I hope it was helpful.