Which of the following is the expected product of the reaction of K(s) and H₂(g)? (i) KH(s), (ii) K₂H(s), (iii) KH₂(s), (iv) K₂H₂(s), or (v) K(s) and H₂(g) will not react with one another.

Video transcript

Welcome back everyone. We need to identify the chemical formula of the product of the reaction between solid calcium and oxygen gas and the conditions are being under heat. So we're going to place a delta sign over our reaction arrow, recall that in this synthesis reaction we have calcium which is located in Group two A. Of our periodic table corresponding to forming a two plus caddy on charge. And oxygen. On the other hand, we find in group six A. Of our periodic table corresponding to a two minus an eye. On that oxygen forms. So recall that for our reaction, we're going to have to swap our subscript of our ions, meaning that we would have see A two and then again when we swap our eye on charges, but we should see that we have a common factor here are common factor Is our subscript of two for both of our atoms. And so we would divide by two in this formula. So see a 2.02. We would divide by the Common factor of two. And this will then simplify to see A. O. As our final formula, since the twos will cancel when we divide both by two. And so for our final answer, we can complete our reaction so that calcium oxide is our product formed. Note that we have two moles of oxygen on the reaction side, so we'll actually produce two moles of calcium oxide to balance this equation. And so the correct choice is going to be choice A and the multiple choice. So I hope this made sense. And let us know if you have any questions.