Question

calculate no of molesin fe in 1.12 g of fe_56​

Answer 1

Explanation:

We can use the above equation to find the mass of a substance when we are given the number of moles of the substance.

Example:

Calculate the mass of (a) 2 moles and (b) 0.25 moles of iron. (Relative atomic mass: Fe = 56)

Solution:

a) mass of 2 moles of iron

= number of moles × molar mass

= 2 × 56

= 112 g

b) mass of 0.25 mole of iron

= number of moles × molar mass

= 0.25 × 56

= 14 g

Example:

Calculate the mass of (a) 3 moles and (b) 0.2 moles of carbon dioxide gas, CO2. (Relative atomic mass: C = 12; O = 16)

Solution:

a) mass of 1 mole of CO2

= (1 × 12) + (2 × 16)

= 44 g

mass of 3 moles of CO2

= 3 × 44

= 132g

b) mass of 0.2 mole of CO2

= 0.2 × 44

= 8.8 g

Answer 2

Answer:

The answer is 0.02 moles of iron....

Explanation: