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Problem 4 Medium Difficulty

Calculate the molecular mass (in amu) of each of the following substances: (a) $\mathrm{C}_{6} \mathrm{H}_{6} \mathrm{O},(\mathrm{b}) \mathrm{H}_{2} \mathrm{SO}_{4},(\mathrm{c}) \mathrm{C}_{6} \mathrm{H}_{6},(\mathrm{d}) \mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6}$
(e) $\mathrm{BCl}_{3},$ (f) $\mathrm{N}_{2} \mathrm{O}_{5},(\mathrm{g}) \mathrm{H}_{3} \mathrm{PO}_{4}$.

Answer

(a) 16.04 amu.
(b) 46.01 amu.
(c) 80.07 amu.
(d) 78.11 amu.
(e) 149.9 amu.
(f) 174.27 amu.
$(g) 310.18$ amu

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Video Transcript

So for this problem, we're supposed to find the molecular mass of a variety of different compounds. And so, as always, the approach is going to be at the atomic mass of each Adam and multiplied by their respective coefficients. So if a party, we have C six each, 60 And so we know that the atomic mass of carbon is going to be 12.1 on their six of them. Six Hye Jin's, which is one point through your eight in what? Oxygen? Just 16.0 And we add those all up. We get 24.11 part B party. We have H two s 04 So now we just have to hide regions. The Amy for hydrogen is 1.8. You have one sulfur, which is 32.7. Number four oxygen's, which is 16.0. We add all these together you get 98 0.8 part C. We have C six h six. So we have six of carbon Jews. We'll put one and six of hydrogen Jews. 1.8 We add those things together. Let me get that are final molecular Mass. 78 0.1 parte de party We have you fix age 12 six. We have six carbons just told 60.1 12 5 regions, which is one point a little late and six oxygen's, which is 16.0 We add those together, put them the calculator, and then we get our answer to the 1 80.16 a m party part you. We have be C. L three. So you just take the m u of B, which is 10.81 and then we add three chlorate, which is 35.43 or 45 We add those all together and you get that The final molecular mass is 1 17 17 atomic mass units part F for part F. We have n 205 three of two of nitrogen and the atomic mass. I'm flattered in his 14.1 five auction Just 16 point. Hello. We add all of those together when we get that the atomic mass A molecular masses 108 No one can you and then part G for part G. We have h three Pierre for so we have three hydrogen ins. Just one point will eight phosphorus, which is 30.97 and then four Oxygen's, which is 16.0. We add all those together and you get that the molecular mass is 98 point zeros. Your so those are all the final answers.