Answer to Question #341428 in Inorganic Chemistry for Amzar

Question

b)  Answer the following stoichiometry questions by referring to the equation below:

2

KClO₃               2 KCl + 3 O₂

i.        If 1.50 moles of KClO₃ decomposes, what is the mass of O₂ that will be produced?

ii.       If 80.0 grams of O₂ was produced, how many moles of KClO₃ are decomposed?

iii.    Find the mass of KClO₃ needed if we need to produce 2.75 moles of KCl.

Answer 1

I. moles of O2 produced are 4.5 moles, M(O₂) = 32, m(O₂) = 32 × 4.5= 144 g.

II. n = m/M = 122.6/80 = 1,53 mol

III. moles of 2.75/2 = 1.375moles, m = 1.375× 122.6 = 168.6 g.