Question

Calculate the average number of moles of iodine atoms in 1 tonne (1000 kg) of the Earth’s crust.​

Answer 1

Answer:

Explanation:

number of moles = given mass /molar mass

= 1000000g / 127 g

= 7874 moles

Answer 2

Given:

The mass of earth's crust = 1000 kg

To Find:

The average number of moles of iodine atoms in the given amount of earth's crust.

Calculation:

- The approximate percentage of iodine in earth's crust = 0.000049 %

⇒ Amount of iodine in 1 kg of earth's crust = 0.000049 kg = 0.049 gm

⇒ Amount of iodine in 1000 kg of earth's crust = 49 gm

- No of moles = 49 / 127

⇒ No of moles = 0.386 moles (approx.)

- So, the average no of moles of iodine atoms in the given amount of earth's crust is approximately 0.386 moles.