Answer:
The equation shows that for every 1 mole of KCIO3 that is decomposed, 1 mole of KCI is produced.
If 5.0g of KCIO3 is decomposed, we can use the molar mass of KCIO3 to convert that to moles.
Molar mass of KCIO3 = 39 + 35.5 + 3(16) = 138.5 g/mol
5.0g of KCIO3 is equal to (5.0g / 138.5 g/mol) = 0.036 moles
And since 1 mole of KCIO3 produces 1 mole of KCI, 0.036 moles of KCIO3 will produce 0.036 moles of KCI.
To convert that to grams, we use the molar mass of KCI, which is 39 + 35.5 = 74.5 g/mol
So, 0.036 moles of KCI is equal to (0.036 moles * 74.5 g/mol) = 2.69g of KCI.