How many grams of potassium chloride are produced if 25 g of potassium chlorate decompose in the reaction #2KClO_3 > 2KCl + 3O_2#?
1 Answer
Aug 6, 2016
15.2 g of KCl would be produced
Explanation:
The general pattern for solving these types of problems is
 Find "moles" of the known substance
 Write down the mole ratio using the coefficients from the balanced equation
 rearrange to solve for the moles "unknown"
 Convert moles "unknown" to required units (i.e. mass, volume, concentration)
So to solve the problem:

Molecular mass of
#KClO_3# = 39.10 + 35.45 + 3(16.00)
= 122.55 
Moles of
#KClO_3# =#25/122.55# = 0.204 mol 
mol ratio:
#mol KCl // mol KClO_3# =#2/2#
so
mol of KCl =#2/2 xx mol KClO_3# mol of KCl =
#2/2 xx 0.204# mol of KCl = 0.204 mol
4.. molecular mass of KCl = 39.10 + 35.45 = 74.55
mass KCl =
Therefore 15.2 g of KCl would be formed.