Determine the number of molecules of ethanol (C2H5OH) in 47.0 g.
Can someone explain to me how to do this?
To determine the number of molecules of ethanol (C2H5OH) in 47.0 g, you can follow these step-by-step instructions:
1. Start by finding the molar mass of ethanol (C2H5OH).
The molar mass is calculated by adding up the atomic masses of all the atoms in one molecule of ethanol. The atomic masses are found on the periodic table.
C (carbon) = 12.01 g/mol
H (hydrogen) = 1.01 g/mol
O (oxygen) = 16.00 g/mol
So, the molar mass of ethanol (C2H5OH) is:
(2 × 12.01 g/mol) + (6 × 1.01 g/mol) + 16.00 g/mol = 46.07 g/mol
2. Next, calculate the number of moles of ethanol (C2H5OH) in 47.0 g.
To do this, divide the mass of the sample by the molar mass:
Number of moles = Mass / Molar mass
Number of moles = 47.0 g / 46.07 g/mol = 1.02 mol
3. Finally, use Avogadro's number (6.02 × 10^23) to determine the number of molecules.
The number of molecules is equal to the number of moles multiplied by Avogadro's number:
Number of molecules = Number of moles × Avogadro's number
Number of molecules = 1.02 mol × 6.02 × 10^23 molecules/mol = 6.12 × 10^23 molecules
Therefore, there are approximately 6.12 × 10^23 molecules of ethanol (C2H5OH) in 47.0 g.
To determine the number of molecules of ethanol (C2H5OH) in 47.0 g, we need to follow a series of steps. Here's how you can do it:
1. Start by finding the molar mass of ethanol (C2H5OH). The molar mass is the sum of the atomic masses of all the atoms in the molecule. You can find the atomic masses from the periodic table.
C: 12.01 g/mol
H: 1.01 g/mol
O: 16.00 g/mol
Molar mass of C2H5OH = (2 * C) + (6 * H) + O = (2 * 12.01) + (6 * 1.01) + 16.00 = 46.07 g/mol
2. Next, use the molar mass to calculate the number of moles of ethanol in 47.0 g. This can be done using the formula:
Moles = Mass / Molar mass
Moles of ethanol = 47.0 g / 46.07 g/mol ≈ 1.020 moles
3. To find the number of molecules, we use Avogadro's number, which states that there are 6.022 x 10^23 molecules in one mole of a substance. Multiply the number of moles by Avogadro's number to get the number of molecules:
Number of molecules = Moles of ethanol * Avogadro's number
Number of molecules = 1.020 moles * 6.022 x 10^23 molecules/mol
Note: Don't forget to include the units in the calculations, as they will cancel out correctly.
The final result will be the number of molecules of ethanol in 47.0 g.
Convert 47.0 g to moles.
moles = grams/molar mass.
Convert moles to # molecules.
There are 6.02 x 10^23 molecules in 1 mole of anything.
yes. You know in one mole, there are 6.02*10^23 molecules.
So the deal is to find how many moles. Find the molmass first(12*2+1*5+16*1+1=46 checkthat, and do it more accurately)
moles= 47/46
number molecules: 47/46 * avagnumber