Ask your homework questions to teachers and professors, meet other students, and be entered to win $600 or an Xbox Series X 🎉Join our Discord! Numerade Educator ### Problem 71 Easy Difficulty # Chromium(III) oxide reacts with hydrogen sulfide (H2S) gas to form chromium(III) sulfide and water:$$\mathrm{Cr}_{2} \mathrm{O}_{3}(s)+3 \mathrm{H}_{2} \mathrm{S}(g) \longrightarrow \mathrm{Cr}_{2} \mathrm{S}_{3}(s)+3 \mathrm{H}_{2} \mathrm{O}(l)$$To produce 421$\mathrm{g}$of$\mathrm{Cr}_{2} \mathrm{S}_{3},$how many (a) moles of$\mathrm{Cr}_{2} \mathrm{O}_{3}$and (b) grams of$\mathrm{Cr}_{2} \mathrm{O}_{3}$are required? ### Answer ## a)$\mathrm{n}\left(\mathrm{Cr}_{2} \mathrm{O}_{3}\right)=2,1 \mathrm{mol}$b)$\mathrm{m}=\mathrm{n}^{*} \mathrm{Mr}=2,1^{*} 152=319,2 \mathrm{g}\$

#### Topics

Chemical reactions and Stoichiometry

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##### Allea C.

University of Maryland - University College

##### Jake R.

University of Toronto

### Video Transcript

eso we have ah, reaction between chromium oxide and hush by the hydra sofa and everybody is Ah, when we, um So far. And I was so far and also water. So you have 4 21 off Colombian. So for being produced, what would be the number more coming oxide? And also the massacre wells I reject that we need. So again, first of all, we could to convert our come yourself fight you limbo most. So we have ah, for 12 link where must offered, um Well, the mass would be 200.21 gram for mo. So ah, from here, you should be able to find that it's fully around two point. Ah, 10 will. Okay, so the lex stab is we're going to find a number almost off a cumbia moxie from the chemical reaction. We can clearly see that, um issue recall monoxide. So you're clear? See that they both have. How refreshing one. So the moral issue between Tokyo me also in chromium self, I will be the same. So they have a militia 1 to 1. So that number almost also he goes to the number most. Or Conley himself I So you 2.1 sumo and the mass off coming outside, we have our limbo. Mo well replied by arm or the mass. So the mother myself, that iss off. We have affinity for four Croft KoreAm, um, and every half flee or hostage in says 1 52 when Permal. So we're going to multiply both together. We should be able to find as it Wilfrid 19 point you grab.

University of Toronto

#### Topics

Chemical reactions and Stoichiometry

##### Allea C.

University of Maryland - University College

##### Jake R.

University of Toronto