Manipur Board Solutions for Chapter: Symbols, Formulas and Equations, Exercise 5: EXERCISES

Translate the following statements into chemical equations and then balance the equations.

Aluminium metal replaces iron from ferric oxide$\left({\mathrm{Fe}}_2{\mathrm{O}}_3\right)$, giving aluminium oxide and iron. 

How many atoms are there in $0.24$ mole of oxygen$\left({\mathrm{O}}_2\right)$?

Convert $12\mathrm{g}$ of nitrogen gas into moles.

Convert $15\mathrm{g}$ of water into moles.

Convert $22\mathrm{g}$ of carbon dioxide into moles.

What is the mass of $0.2$ mole of chlorine$\left({\mathrm{Cl}}_2\right)$gas.

What is the mass of $0.5$ mole of water molecules.

Calculate the number of potassium ions present in $7.45\mathrm{g}$ of potassium oxide. (Atomic mass of $\mathrm{K}=39\mathrm{u}$)