Question

How many moles are 4.515 x 10²⁴ atoms of hydrogen?

a) 0.75 moles
b) 1.5 moles
c) 2.5 moles
d) 4.5 moles

Answer 1

To determine the number of moles of hydrogen atoms, use Avogadro's number to calculate the number of moles from the given number of atoms.

Step-by-step explanation:

To determine the number of moles of hydrogen atoms, we use Avogadro's number, which states that 1 mole of any substance contains 6.022 x 1023 particles.

In this case, we have 4.515 x 1024 atoms of hydrogen. So the number of moles can be calculated as:

4.515 x 1024 atoms / (6.022 x 1023 atoms/mole) = 7.5 moles

Therefore, the correct answer is option b) 1.5 moles.