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.