Calculate the molecular masses of Calcium carbonate$\left({\mathrm{CaCO}}_3\right)$.

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

Chlorine gas burns in hydrogen gas to give hydrogen chloride.

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

Hydrogen sulphide gas burns in the air to give water and sulphur dioxide.

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

Hydrogen gas combines with nitrogen to give ammonia, ${\mathrm{NH}}_3$

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

Sodium metal reacts with water to give sodium hydroxide and hydrogen gas.