Gram to gram 1) 4Al + 3MnO2 = 2Al2O3 + 3Mn How many grams of Mn are produced fro

Question

Gram to gram
1) 4Al + 3MnO2 = 2Al2O3 + 3Mn
How many grams of Mn are produced from 50.0 g of Al2O3?

2) A laboratory method to prepare O2 (g) consists of the decomposition of KClO3 (s)

2KClO3 = 2KCl (s) + 3 O2 (g)

3) How many grams of KCl3 (s) must be decomposed to obtain 50.0 g of O2 (g)

Gram to mol
1) How many moles of O2 (g) are produced when 32.8 g of KCl3 (s) are broken down?

Limiting reagent and% yield
1) The powerful nitroglycerin explosive decomposes according to:
4C3H5N3O9 = 6N2 + 12CO2 + 10H2O + O2
The rapid formation of gaseous products, together with the generation of heat, is what produces the explosion. Calculate the yield (as such, and in percent) in an explosion in which 200 g of nitroglycerin produce 6.55 g of O2.

Explanation / Answer

1)

4Al + 3MnO2 -------------> 2 Al2O3    + 3 Mn

                                               203.92 g      164.8 g

                                               50 g                 ??

mass of Mn produced = 50 x 164.8 / 203.92

mass of Mn produced    = 40.4 g

2)

2 KClO3 ----------------> 2KCl (s) + 3 O2 (g)

245.1 g                                             96 g

??                                                   50 g

mass of KClO3 decomposed = 50 x 245.1 / 96

mass of KClO3 decomposed = 127.7 g

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