Question

Calculate the number of moles for the following.
(a) 72 g of carbon atoms [Atomic mass of C = 12 u]
(b) 40 g of Helium atoms [Atomic mass of He = 4 u]

Answer 1

Answer:

(a) 6mole

(b) 10 mole

Explanation:

(a) 72g of Carbon

Number of moles = mass of the element /

atomic mass of the element

= 72/12

= 6 mole

(b) 40g of Helium

Number of moles = mass of the element /

atomic mass of the

element

= 40/4

= 10 mole