Question

How many moles of atoms are there in 1 mol of pentane (c5h12)

a. 5
b. 12
c. 1
d. 17?

Answer 1

There are 5 moles of atoms in 1 mole of pentane (C5H12).

Step-by-step explanation:

There are 5 moles of atoms in 1 mole of pentane (C5H12).

Pentane has a chemical formula of C5H12, which means it contains 5 carbon atoms (C) and 12 hydrogen atoms (H).

Since 1 mole of pentane contains 5 moles of carbon atoms and 12 moles of hydrogen atoms, the answer is (a) 5.

Answer 2

Correct answer: d) 17

The chemical formula of pentane is
`C_(5)H_(12)`

The subscript of each element represents the number of moles of atoms of that element present in one formula unit of the molecule.

Pentane has carbon and hydrogen atoms. The subscript of C is 5 indicating that each mole of pentane has 5 moles of carbon atoms. Similarly the subscript on hydrogen is 12 indicating that each mole of pentane has 12 moles of hydrogen atoms.

Therefore, the total number moles of atoms in one mole pentane = 5 C +12 H = 17