The mole and the Avogadro constant — Chemistry 0620 IGCSE Question & Worked Solution

(a(i))[2]

How many moles are present in 8.88 g of calcium hydroxide?

(a(ii))[1]

How many moles of chlorine gas are there in 7200 cm$^3$?

(a(iii))[1]

Calculate the maximum number of moles of calcium chlorate(V) that can be formed from 8.88 g of calcium hydroxide and 7200 cm$^3$ of chlorine gas?

(a(iv))[2]

Calculate the maximum mass of calcium chlorate(V) that can be formed from 8.88 g of calcium hydroxide and 7200 cm$^3$ of chlorine gas?

(a(v))[1]

Calculate the percentage yield.

(b(i))[1]

What must be done to calcium chlorate(V) for thermal decomposition to occur?

(b(ii))[2]

Write a chemical equation showing the thermal decomposition of calcium chlorate(V).

(c(i))[1]

What colour does methyl orange indicator show in chloric(V) acid?

(c(ii))[1]

Define the term acid in terms of proton transfer.

(c(iii))[1]

Finish the chemical equation to show HClO$_3$ behaving as an acid in water. HClO$_3$ + H$_2$O $\rightarrow$ ............... + ...............

The mole and the Avogadro constant — practice question