5. Which of the following pair of elements represents a mole ratio of 1:1?
(a) 10 g of calcium and 12 g of magnesium
(b) 12 g of magnesium and 6 g of carbon
(c) 12 g of carbon and 20 g of calcium
(d) 20 g of sodium and 20 g of calcium
Answers
Answer:
b is the correct option.
Explanation:
No. of moles in 12 gram of magnesium
=12/24=0.5 mole
No. of moles in in 6 gram of carbon
=6/12=0.5 mole
Ratio=0.5/0.5=1:1
We know that,
No. Of mole=given mass of the element/atomic weight of the element
CARBON:
Given, mass of the carbon = 6g
Molar mass of the carbon=12g
No.of the moles of the carbon=6/12
➡️0.5moles
MAGNESIUM:
Given, mass of the magnesium=12g
Molar mass of the magnesium =24g
No.of the moles of the carbon = 12/24
➡️2/4
➡️1/2
➡️0.5moles
RATIO:
➡️0.5/0.5
➡️1/1
➡️1:1
12 g of magnesium and 6 g of carbon of elements represents a mole ratio of 1:1
So, option;(b) 12 g of magnesium and 6 g of carbon.