How many moles of molecules are contained in 25.4g of glucose (C_6 H_12 O_6)
To calculate the number of moles of molecules in 25.4 g of glucose (C6H12O6), we need to first calculate its molar mass.
Molar mass of glucose (C6H12O6) = (6 x 12.01 g/mol) + (12 x 1.01 g/mol) + (6 x 16.00 g/mol) = 180.18 g/mol
Now, we can use the formula:
Number of moles = given mass / molar mass
Number of moles of glucose = 25.4 g / 180.18 g/mol = 0.141 mol
Therefore, there are 0.141 moles of glucose molecules in 25.4 g of glucose.
To determine the number of moles of molecules in a given mass of a substance, you need to use the molar mass of that substance.
The molecular formula of glucose (C6H12O6) tells us that one molecule of glucose contains 6 carbon atoms, 12 hydrogen atoms, and 6 oxygen atoms.
Now, let's calculate the molar mass of glucose:
- The atomic mass of carbon (C) is approximately 12.01 g/mol.
- The atomic mass of hydrogen (H) is approximately 1.01 g/mol.
- The atomic mass of oxygen (O) is approximately 16.00 g/mol.
To find the molar mass of glucose, you multiply the atomic masses of each element by the number of atoms present in one molecule of glucose, and then add them up:
(6 * 12.01 g/mol) + (12 * 1.01 g/mol) + (6 * 16.00 g/mol) = 180.18 g/mol
Therefore, the molar mass of glucose (C6H12O6) is approximately 180.18 g/mol.
To find the number of moles of molecules in 25.4 g of glucose, divide the given mass by the molar mass:
Number of moles = Mass / Molar mass
Number of moles = 25.4 g / 180.18 g/mol ≈ 0.141 moles
Hence, there are approximately 0.141 moles of molecules in 25.4 g of glucose.