what is the percent hydrgoen in toluene(C7H8)??
If you had 50 lbs oranges and 50 lbs apples, what percent apples do you have?
It's (50/100)*100 = 50%.
Same thing with atoms.
What is the total mass of C7H8. What is the mass of total H. Then percent H = (mass H/total mass)*100 = ??
There is more than one answer. The answer from Dr Bob is correct but you could also have the answer in terms of atoms. So the percentage of hydrogen atoms in toluene is
(8/15) *100
The problem is that the question does not state what percentage it is looking for. It would be equally possible to calculate the percentage volume occupied by the hydrogen atoms.
I think the question is intended for %H by mass:
Using atomic masses and subscripts in C7H8,
%H = (100)(8)(1.00794)/[(7)(12.011)(8)+(8)(1.00794)]
%H = 8.75% by mass
If you heated a hydrate too quickly and some of it splattered out of the beaker how would it affect the calclated percent by mass of water and the molecular formula
To find the percent of hydrogen in toluene (C7H8), we need to calculate the molar mass of hydrogen and then divide it by the molar mass of toluene.
First, let's calculate the molar mass of hydrogen (H). The molar mass of hydrogen is approximately 1 g/mol.
Second, let's calculate the molar mass of toluene (C7H8). To do this, we need to find the molar mass of each element (carbon and hydrogen) in the compound and then add them up.
The atomic mass of carbon (C) is approximately 12 g/mol, and there are 7 carbon atoms in toluene. So, the total molar mass of carbon in toluene is 12 g/mol × 7 = 84 g/mol.
The atomic mass of hydrogen (H) is approximately 1 g/mol, and there are 8 hydrogen atoms in toluene. So, the total molar mass of hydrogen in toluene is 1 g/mol × 8 = 8 g/mol.
Now, we can calculate the total molar mass of toluene by adding the molar masses of carbon and hydrogen: 84 g/mol + 8 g/mol = 92 g/mol.
Finally, to find the percent of hydrogen in toluene, we can use the formula:
Percent hydrogen = (Molar mass of hydrogen / Molar mass of toluene) × 100
Plugging in the values we calculated:
Percent hydrogen = (8 g/mol / 92 g/mol) × 100 ≈ 8.70%
Therefore, the percent hydrogen in toluene (C7H8) is approximately 8.70%.