What is the molecular formula of a hydrocarbon that has 1 triple ...

Question

What is the molecular formula of a hydrocarbon that has 1 triple bond, 2 double bonds, 1 ring, and 32 carbons?

Accepted Answer

Hey, everyone, let's do this problem and says, determine the appropriate molecular formula of a compound which contains only carbon and hydrogen and has one ring, three double bonds, one triple bond and 18 carbons. So we're looking for a molecular formula. Alright. Well, what do we need in order to complete a molecular formula? All we need to know is the number of carbons and the number of hydrogen. Well, we're halfway there guys, we already have the number of carbons. So we just need to find the number of hydrogen. Alright, well, what other information were we given? We were given some factors or characteristics of unsaturated shin on our compound. So we can use the degrees oven saturation formula or index of hydrogen deficiency right to solve for our number of hydrogen is because we know the degrees oven saturation from the characteristics that we were given. So this formula is two times the number of carbons plus two plus the number of nitrogen minus the number of hydrogen is minus the number of halogen, all divided by two. And the information we were given of the characteristics, how do these relate to our problem? So we were given that our compound has one ring which is a value of one for degrees oven saturation, three double bonds, which is also a value of one. So one times three is three And we have one triple bond which has a value of two degrees oven saturation. So one plus three plus two is six. Alright. So let's plug in our six and our number of carbons and saul for our number of hydrogen. So we have six equals two times. The number of carbons is 18 plus two. We don't have any nitrogen or halogen. So I'll skip over those and just write minus H and that is all over to. So moving our two over to multiply by six, we get 12. Let me not skip any steps here. So 12, I'm so used to just skipping the steps, solving it fast. Alright, so then we have 12 equals 18 times two is 36 Plus two is minus each. So if we Add h subtract to both sides, We get h equals 38 -12, which is 26. Alright. So our molecular formula will be C 18 for 18 carbons and H 26 right? We usually write carbons first and hydrogen second, which makes be the correct answer for this problem. That's it for this one. I hope this video is helpful and thanks for watching.

What is the molecular formula of a hydrocarbon that has 1 triple bond, 2 double bonds, 1 ring, and 32 carbons?

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