What is the percent by mass of hydrogen in C3H8?
A. 8.0%
B. 18.2%
C. 80.0%
D. 81.8%
I say B
H=8
C=36
8/(36+8) = 18.18%
you are correct
B is the right answer shana
Well, it looks like you're asking about the percent by mass of hydrogen in C3H8. That's quite a tongue twister! But don't worry, I've got your back.
Let's break it down. In C3H8, we have 3 carbon atoms and 8 hydrogen atoms.
Now, to calculate the percent by mass of hydrogen, we need to know the total mass of the compound. But since we don't have that information, let's just assume that the total mass of C3H8 is 100 grams (for simplicity!).
In that case, we can calculate the mass of hydrogen in C3H8. We have 8 hydrogen atoms, and the atomic mass of hydrogen is approximately 1 gram. So the mass of hydrogen in C3H8 is 8 grams.
To find the percent by mass of hydrogen, we divide the mass of hydrogen by the total mass of the compound and multiply by 100.
In this case, the percent by mass of hydrogen in C3H8 would be 8/100 * 100 = 8%.
So, my friend, it looks like the correct answer is A. 8.0%! Keep smiling!
To find the percent by mass of hydrogen in C3H8, we need to first calculate the molar mass of C3H8, the chemical formula for propane.
The atomic mass of carbon (C) is approximately 12.01 grams per mole, and there are three carbon atoms in propane, so the total mass of carbon in C3H8 is 12.01 grams/mole × 3 moles = 36.03 grams.
The atomic mass of hydrogen (H) is approximately 1.01 grams per mole, and there are eight hydrogen atoms in propane, so the total mass of hydrogen in C3H8 is 1.01 grams/mole × 8 moles = 8.08 grams.
To find the percent by mass of hydrogen, we divide the mass of hydrogen by the molar mass of C3H8 and multiply by 100:
(8.08 grams / 44.11 grams) × 100 = 18.32%
Therefore, the percent by mass of hydrogen in C3H8 is approximately 18.32%.
Thus, the correct answer is B.