116 g of isopropanol, formula C3H8O, contains how many moles?

moles = grams/molar mass

To determine the number of moles in 116 g of isopropanol (C3H8O), you will need to use the molar mass of isopropanol.

First, you need to find the molar mass of each element in isopropanol (C3H8O):
- Carbon (C) has a molar mass of approximately 12.01 g/mol.
- Hydrogen (H) has a molar mass of approximately 1.01 g/mol.
- Oxygen (O) has a molar mass of approximately 16.00 g/mol.

Next, multiply the molar mass of each element by the number of atoms of that element present in isopropanol:
- The molar mass of carbon (C3) is 3 * 12.01 g/mol = 36.03 g/mol.
- The molar mass of hydrogen (H8) is 8 * 1.01 g/mol = 8.08 g/mol.
- The molar mass of oxygen (O) is 16.00 g/mol for 1 atom.

Now add up the molar masses of each individual element to get the molar mass of isopropanol:
Molar mass of isopropanol (C3H8O) = 36.03 g/mol + 8.08 g/mol + 16.00 g/mol = 60.11 g/mol.

Finally, divide the given mass (116 g) by the molar mass (60.11 g/mol) to find the number of moles:
Number of moles = 116 g / 60.11 g/mol = 1.932 moles (approximately).

Therefore, 116 g of isopropanol contains approximately 1.932 moles of isopropanol.