1ACS exams ful information; or, sometimes it is inclo know it. These two convers

Question

1ACS exams ful information; or, sometimes it is inclo know it. These two conversion through moles to atoms. If the reacht iu pa An inspection o every three mo of SbF,. Here i ote the two factors used to make the conversion lui con, Such values will always be available to you from the periodic table that a ne value of Avogadro's number will also be given in a table of useful information: or with the question itself. Since you use this value so often, you probably already know it. The factors are arranged so that the units cancel in making the change from grams through mole (conversion were desired in the reverse direction, then both factors would be inverted. ST-4. A hydrocarbon with general formula CH, was burned completely in air, yielding 0,18 g of water and 0,44 g of carbon dioxide. Which formula could give such data? Formula H;0 CO, CH, Molar Mass 18.0 g mot 44.0 g mot (D) CH, The correct an detect likely e equation, you change grams this is also wr answer, choic C,H, (C) (B) (A) CH,

Explanation / Answer

moles of H can be calculated as---

0.18 g x ( 1 mol H2O /18.0gmol-1) x ( 2 mol H / 1 mol H2O) = 0.02 mol H

and moles of C can be calculated as--

0.44 g x ( 1 mol CO2 / 44.0 gmol-1) x ( 1 mol C / 1 mol CO2) = 0.01 mol C

Now, divide by the smallest mol value,

mol of C = 0.01 /0.01 = 1

mol of H = 0.02 /0.01 = 2

Thus we have got CH2

CH2 can be found by dividing C2H4 / 2 = CH2

So, our answer will be B) C2H4

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