Question

What is the mass in grams of 5.90 mol C8H18?

Answer 1

To find the mass in grams of 5.90 mol C8H18, we need to first calculate the molar mass of C8H18 (octane).

The molar mass of carbon (C) is 12.01 g/mol.
There are 8 carbon atoms in each molecule of octane, so the total mass of carbon in one molecule of octane is: 8 * 12.01 g/mol = 96.08 g/mol.

The molar mass of hydrogen (H) is 1.01 g/mol.
There are 18 hydrogen atoms in each molecule of octane, so the total mass of hydrogen in one molecule of octane is: 18 * 1.01 g/mol = 18.18 g/mol.

To find the molar mass of octane, we add the mass of carbon and hydrogen: 96.08 g/mol + 18.18 g/mol = 114.26 g/mol.

Now we can calculate the mass in grams of 5.90 mol C8H18:
mass = number of moles * molar mass
mass = 5.90 mol * 114.26 g/mol = 672.074 g.

Therefore, the mass in grams of 5.90 mol C8H18 is 672.074 g.